論文 - 辺土　正人

Effect of S 3⁢p and Se 4⁢p holes on charge fluctuations in pyrite-type CuS₂ and CuSe₂ revealed by hard x-ray photoemission spectroscopy

K. Fujinuma, D. Takegami, A. Melendez-Sans, M. Yoshimura, K.-D. Tsuei, R. Higashinaka, T. D. Matsuda, Y. Aoki, M. Hedo, Y. Onuki, L. H. Tjeng, T. Mizokawa

Physical Review B ( American Physical Society )  111 ( 11 ) 115147   2025年03月 [ 査読有り ]

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Helicity Unification by Triangular Skyrmion Lattice Formation in the Noncentrosymmetric Tetragonal Magnet EuNiGe₃

T. Matsumura, K. Kurauchi, M. Tsukagoshi, N. Higa, H. Nakao, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki

Journal of the Physical Society of Japan ( The Physical Society of Japan )  93   074705   2024年06月 [ 査読有り ]

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Single helicity of the triple- triangular skyrmion lattice state in the cubic chiral helimagnet EuPtSi

T. Matsumura, C. Tabata, K. Kaneko, H. Nakao, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki

Physical Review B ( American Physical Society )  109   174437   2024年05月 [ 査読有り ]

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Antiferromagnetic state in EuAl₄ studied by ²⁷Al zero-field NMR

H. Niki, N. Higa, S. Nakamura, M. Yogi, A. Nakamura, K. Niki, T. Maehira, M. Hedo, T. Nakama, Y. Ōnuki

Interactions ( Springer )  245   46 - 46   2024年03月 [ 査読有り ]

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Anomalous Hall Effect in Rare Earth Antiferromagnets with the Hexagonal Structures

Y. Ōnuki, K. Nakaima, W. Iha, S. Matsuda, M. Hedo, T. Nakama, D. Aoki, A. Nakamura, M. Nakashima, Y. Amako, T. Takeuchi, T. D. Matsuda

New Physics: Sae Mulli ( Korean Physical Society )  73   1054 - 1057   2023年12月 [ 査読有り ]

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Helicity Selection of the Cycloidal Order in Noncentrosymmetric EuIrGe₃

K. Kurauchi, T. Matsumura, M. Tsukagoshi, N. Higa, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki

Journal of Physical Society of Japan ( Physical Society of Japan )  92 ( 8 ) 083701   2023年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The magnetic helicities of the cycloidal ordering in EuIrGe#D3#DR, with a noncentrosymmetric tetragonal structure, have been studied by circularly polarized resonant X-ray diffraction. It is shown that the helicity of each cycloidal domain is uniquely determined and satisfies the symmetry relations of the C#D4v#DR point group of the crystal structure. The result shows that the cycloidal helicity is determined by the Dzyaloshinskii–Moriya type antisymmetric exchange interaction. The domain selection and the phase transition by the external magnetic field along [100] and [110] have also been studied. It is shown that the cycloidal plane prefers to be perpendicular to the field and the transverse conical state is realized.

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Magnetic and Transport Properties of EuZn₁₁ Single Crystals

Yuta Ameku, Hirota Tanaka, Shinji Hotta, Miho Nakashima, Yasushi Amako, Ai Nakamura, Dexin Li, Dai Aoki, Masato Hedo, Takao Nakama

JPS Conference Proceedings ( The Physical Society of Japna )  38   011094   2023年05月 [ 査読有り ]

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Elastic Property of EuAl₄ Probed by Ultrasonic Measurements

T. Sato, N. Shishiki, K. Wakiya, M. T. Nakamura, M. Yoshizawa, M. Hedo, A. Nakamura, Y. Ōnuki, Y. Nakanishi

JPS Conference Proceedings ( The Physical Society of Japan )  38   011097 - 1-6   2023年05月 [ 査読有り ]

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Magnetic and Transport Properties of EuCuIn₄ Single Crystals

Ai Nakamura, Hirota Tanaka, Yuta Ameku, Dexin Li, Dai Aoki, Masato Hedo, Takao Nakama

JPS Conference Proceedings ( The Physical Society of Japan )  38   011099 - 1-6   2023年05月 [ 査読有り ]

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Anomalously large spin-dependent electron correlation in the nearly half-metallic ferromagnet CoS₂

H. Fujiwara, K. Terashima, J. Otsuki, N. Takemori, H. O. Jeschke, T. Wakita, Y. Yano, W. Hosoda, N. Kataoka, A. Teruya, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki, K. Yaji, A. Harasawa, K. Kuroda, S. Shin, K. Horiba, H. Kumigashira, Y. Muraoka, T. Yokoya

Physical Review B ( Physical Review B )  106 ( 8 ) 085114   2022年08月 [ 査読有り ]

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Cycloidal Magnetic Ordering in Noncentrosymmetric EuIrGe₃

T. Matsumura, M. Tsukagoshi, Y. Ueda, N. Higa, A. Nakao, K. Kaneko, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  91 ( 7 ) 073703   2022年06月 [ 査読有り ]

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Electronic structure of the intermediate-valence compound EuNi₂P₂ studied by soft x-ray photoemission spectroscopy

I. Kawasaki, M. Kobata, S.-i. Fujimori, Y. Takeda, H. Yamagami, M. Hedo, T. Nakama, Y. Ōnuki

Physical Review B ( Physical Review B )  104 ( 16 ) 165124   2021年10月 [ 査読有り ]

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Chirality-Induced Spin Polarization over Macroscopic Distances in Chiral Disilicide Crystals.

Shiota K, Inui A, Hosaka Y, Amano R, Ōnuki Y, Hedo M, Nakama T, Hirobe D, Ohe JI, Kishine JI, Yamamoto HM, Shishido H, Togawa Y

Physical review letters ( Physical Review Letters )  127 ( 12 ) 126602   2021年09月 [ 査読有り ]

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Critical slowing-down and field-dependent paramagnetic fluctuations in the skyrmion host EuPtSi: and NMR studies

N. Higa, T. U. Ito, M. Yogi, T. Hattori, H. Sakai, S. Kambe, Z. Guguchia, W. Higemoto, M. Nakashima, Y. Homma, A. Nakamura, F. Honda, Y. Shimizu, D. Aoki, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki, Y. Tokunaga

Physical Review B ( Physical Review B )  104 ( 4 ) 045145   2021年07月 [ 査読有り ]

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Charge-Density-Wave Order and Multiple Magnetic Transitions in Divalent Europium Compound EuAl₄

Koji Kaneko, Takuro Kawasaki, Ai Nakamura, Koji Munakata, Akiko Nakao, Takayasu Hanashima, Ryoji Kiyanagi, Takashi Ohhara, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  90 ( 6 ) 64704 - 1-6   2021年06月 [ 査読有り ]

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Magnetic phase transitions of the 4f skyrmion compound EuPtSi studied by magnetization measurements

T. Sakakibara, S. Nakamura, S. Kittaka, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  90 ( 6 ) 064701   2021年06月 [ 査読有り ]

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Weakly anisotropic ferromagnet EuRu₂P₂: Ambient and hydrostatic pressure characterization

P. Proschek, J. Prchal, M. Diviš, J. Prokleška, K. Vlášková, J. Valenta, J. Zubáč, J. Kaštil, M. Hedo, T. Nakama, Y. Ōnuki, F. Honda

Journal of Alloys and Compounds ( Journal of Alloys and Compounds )  864   158753   2021年05月 [ 査読有り ]

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Magnetization Process in EuCo₂P₂ and EuT₂Ge₂ (T: transition metal): Comparison of Experiment and Theory

Takeuchi Tetsuya, Tahara Time, Kida Takanori, Narumi Yasuo, Hagiwara Masayuki, Kindo Koichi, Iha Wataru, Ashitomi Yousuke, Yara Tomoyuki, Nakashima Miho, Amako Yasushi, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  90 ( 3 ) 34709 - 34709   2021年03月 [ 査読有り ]

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Angle dependence of the magnetic phase diagram in cubic chiral antiferromagnet EuPtSi

T. Takeuchi, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  89 ( 9 ) 093703   2020年09月 [ 査読有り ]

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Unique Electronic States of Eu-based Compounds

Onuki Yoshichika, Hedo Masato, Honda Fuminori

Journal of the Physical Society of Japan ( Physical Society of Japan )  89 ( 10 ) 102001 - 1-28   2020年09月 [ 査読有り ]

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Quantum criticality of valence transition for the unique electronic state of antiferromagnetic compound EuCu₂Ge₂

J. Gouchi, K. Miyake, W. Iha, M. Hedo, T. Nakama, Y. Ōnuki, Y. Uwatoko

Journal of the Physical Society of Japan ( Journal of the Physical Society of Japan )  89 ( 5 ) 053703 - 053703   2020年05月 [ 査読有り ]

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Quasi-one-dimensional magnetic interactions and conduction electrons in EuCu₅ and EuAu₅ with the characteristic hexagonal structure

S. Matsuda, J. Ota, K. Nakaima, W. Iha, J. Gouchi, Y. Uwatoko, M. Nakashima, Y. Amako, F. Honda, D. Aoki, A. Nakamura, T. Takeuchi, Y. Haga, H. Harima, M. Hedo, T. Nakama, Y. Ōnuki

Philosophical Magazine ( Philosophical Magazine )  100   1244 - 1257   2020年04月 [ 査読有り ]

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Electronic Structure of Trivalent Compound EuPd₃ Studied by Soft X-ray Angle-resolved Photoemission Spectroscopy

Kawasaki Ikuto, Kobata Masaaki, Fujimori Shin-ichi, Takeda Yukiharu, Yamagami Hiroshi, Nakamura Ai, Iha Wataru, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  89 ( 4 ) 44704 - 44704   2020年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

EuPd3 is a rare Eu-based compound, whose Eu ions are in a trivalent state. The electronic structure of EuPd3 was investigated by angle-resolved photoemission spectroscopy (ARPES) using soft x rays. Eu3+ components arising from the 4f(5) final state multiplet were clearly observed in the valence spectra, and no Eu2+ components were observed within experimental accuracy, confirming a robust Eu3+ state. The band structure and Fermi surfaces revealed by the ARPES measurements were compared to band structure calculations based on the density-functional theory for LaPd3 and YPd3. We found that the calculation for LaPd3 provides a better description for our ARPES results. The effective electron masses estimated from the ARPES spectra near the Fermi level are in good agreement with the corresponding cyclotron effective masses in previous de Haas-van Alphen experiments.

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Electronic Structure of the Valence Transition System Eu(Rh_1−xT_x)₂Si₂ (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy

Ryohei Shimokasa, Naomi Kawamura, Taku Kawabata, Gen Isumi, Takayuki Uozumi, Akihiro Mitsuda, Hirofumi Wada, Fuminori Honda, Masato Hedo, Takao Nakama, Yoshichika Ōnuki, Masaichiro Mizumaki, Kojiro Mimura

JPS Conference Proceedings ( Physical Society of Japan )  30   011134   2020年03月 [ 査読有り ]

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Unique Skyrmion Phases and Conduction Electrons in Cubic Chiral Antiferromagnet EuPtSi and Related Compounds

Yoshichika {\={O } }nuki, Masashi Kakihana, Wataru Iha, Kenri Nakaima, Dai Aoki, Ai Nakamura, Fuminori Honda, Miho Nakashima, Yasushi Amako, Jun Gouchi, Yoshiya Uwatoko, Shota Nakamura, Toshiro Sakakibara, Tetsuya Takeuchi, Yoshinori Haga, Hiroaki Ikeda, Hisatomo Harima, Masato Hedo, Takao Nakama

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019) ( Journal of the Physical Society of Japan )    2020年03月 [ 査読有り ]

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Single Crystal Growth and Electronic Properties of Mn₂P and Fe₂P

Jouji Ota, Masashi Kakihana, Kenri Nakaima, Shinya Matsuda, Takanori Kida, Masayuki Hagiwara, Miho Nakashima, Yasushi Amako, Dai Aoki, Ai Nakamura, Fuminori Honda, Yoshinori Haga, Hisatomo Harima, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019) ( Journal of the Physical Society of Japan )    2020年03月 [ 査読有り ]

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Spin Glass Behavior in EuCu₂Si₂ Single Crystal Grown by the Flux Method

Takeuchi Tetsuya, Haga Yoshinori, Taniguchi Toshifumi, Iha Wataru, Ashitomi Yousuke, Yara Tomoyuki, Kida Takanori, Tahara Time, Hagiwara Masayuki, Nakashima Miho, Amako Yasushi, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  89 ( 3 ) 34705 - 34705   2020年03月 [ 査読有り ]

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Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Tetsuya Takeuchi, Wataru Iha, Masashi Kakihana, Yousuke Ashitomi, Takanori Kida, Time Tahara, Masayuki Hagiwara, Yoshinori Haga, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

JPS Conference Proceedings ( Physical Society of Japan )  29   012005   2020年02月 [ 査読有り ]

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Single Crystal Growth and Unique Electronic States of Cubic Chiral EuPtSi and Related Compounds

Yoshichika Ōnuki, Masashi Kakihana, Wataru Iha, Kenri Nakaima, Dai Aoki, Ai Nakamura, Fuminori Honda, Miho Nakashima, Yasushi Amako, Jun Gouchi, Yoshiya Uwatoko, Shota Nakamura, Toshiro Sakakibara, Tetsuya Takeuchi, Yoshinori Haga, Hiroaki Ikeda, Hisatomo Harima, Masato Hedo, Takao Nakama

JPS Conference Proceedings ( Physical Society of Japan )  29   012001   2020年02月 [ 査読有り ]

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Single Crystal Growth and Magnetic Properties of Antiferromagnets EuGe and EuGe₂

Shinya Matsuda, Wataru Iha, Fuminori Honda, Jun Gouchi, Yoshiya Uwatoko, Miho Nakashima, Yasushi Amako, Tetsuya Takeuchi, Takanori Kida, Masayuki Hagiwara, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

JPS Conference Proceedings ( Physical Society of Japan )  29   012003   2020年02月 [ 査読有り ]

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De Haas–van Alphen Effect and Fermi Surface Properties of Antiferromagnet EuSnP

Wataru Iha, Shinya Matsuda, Fuminori Honda, Tetsuya Takeuchi, Jun Gouchi, Yoshiya Uwatoko, Hisatomo Harima, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

JPS Conference Proceedings ( Physical Society of Japan )  29   012002   2020年02月 [ 査読有り ]

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¹⁵³Eu Zero-field NMR Study of Antiferromagnetic State in EuAl₄

Haruo Niki, Saori Nakamura, Nonoka Higa, Mamoru Yogi, Ai Nakamura, Kaori Niki, Takahiro Maehira, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena ( Journal of the Physical Society of Japan )    2020年02月 [ 査読有り ]

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Fermi Surfaces and Magnetoresistance of Dirac Conduction Electrons in PbX (X: S, Se, Te) and AMnBi2 (A=Ca, Sr)

Kenri Nakaima, Shinya Matsuda, Wataru Iha, Shoya Kawakatsu, Masashi Kakihana, Takanori Kida, Masayuki Hagiwara, Tetsuya Takeuchi, Dai Aoki, Ai Nakamura, Jun Gouchi, Yoshiya Uwatoko, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena ( Journal of the Physical Society of Japan )  29   013005-1 - 013005-7   2020年02月 [ 査読有り ]

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Electronic States of Sn4P3: Analogue of Topological Insulator Bi2Se3

Kenri Nakaima, Shoya Kawakatsu, Masashi Kakihana, Dai Aoki, Ai Nakamura, Fuminori Honda, Hisatomo Harima, Masato Hedo, Takao Nakama, Yoshichika Onuki

Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena ( Journal of the Physical Society of Japan )    2020年02月 [ 査読有り ]

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Magnetic Field Induced Triple-q Magnetic Order in Trillium Lattice Antiferromagnet EuPtSi Studied by Resonant X-ray Scattering

Tabata Chihiro, Matsumura Takeshi, Nakao Hironori, Michimura Shinji, Kakihana Masashi, Inami Toshiya, Kaneko Koji, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 9 ) 093704 - 093704   2019年08月 [ 査読有り ]

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Unique Magnetic Phases in the Skyrmion Lattice and Fermi Surface Properties in Cubic Chiral Antiferromagnet EuPtSi

Kakihana Masashi, Aoki Dai, Nakamura Ai, Honda Fuminori, Nakashima Miho, Amako Yasushi, Takeuchi Tetsuya, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 9 ) 094705 - 094705   2019年08月 [ 査読有り ]

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Magnetic Fluctuation and First-Order Transition in Trillium Lattice of EuPtSi Observed by ¹⁵¹Eu Mössbauer Spectroscopy

Y. Homma, M. Kakihana, Y. Tokunaga, M. Yogi, M. Nakashima, A. Nakamura, Y. Shimizu, D. X. Li, A. Maurya, Y. J. Sato, F. Honda, D. Aoki, Y. Amako, M. Hedo, T. Nakama, Y. Ōnuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 9 ) 094702 - 094702   2019年08月 [ 査読有り ]

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Fluctuation-Induced First-Order Transition and Tricritical Point in EuPtSi

Sakakibara Toshiro, Nakamura Shota, Kittaka Shunichiro, Kakihana Masashi, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 9 ) 093701 - 093701   2019年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Electronic states of EuCu₂Ge₂ and EuCu₂Si₂ studied by soft X-ray photoemission spectroscopy

I. Kawasaki, S. Fujimori, Y. Takeda, H. Yamagami, W. Iha, M. Hedo, T. Nakama, Y. Onuki

Physical Review B ( Physical Review B )  100 ( 3 ) 035111 - 035111   2019年07月 [ 査読有り ]

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Linear magnetoresistance in the low-field limit in density-wave materials.

Feng Y, Wang Y, Silevitch DM, Yan JQ, Kobayashi R, Hedo M, Nakama T, Ōnuki Y, Suslov AV, Mihaila B, Littlewood PB, Rosenbaum TF

Proceedings of the National Academy of Sciences of the United States of America ( Proceedings of the National Academy of Sciences of the United States of America )  116 ( 23 ) 11201 - 11206   2019年06月 [ 査読有り ]

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Magnetic Field versus Temperature Phase Diagram for H ‖ [001] in the Trillium Lattice Antiferromagnet EuPtSi

Takeuchi Tetsuya, Kakihana Masashi, Hedo Masato, Nakama Takao, Onuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 5 ) 053703 - 053703   2019年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fermi Surface Properties of Semimetals YSb, LuSb, YBi, and LuBi Studied by the de Haas–van Alphen Effect

Kakihana Masashi, Nishimura Kengo, Takeuchi Tetsuya, Haga Yoshinori, Harima Hisatomo, Hedo Masato, Nakama Takao, Onuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 4 ) 044712 - 044712   2019年03月 [ 査読有り ]

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De Haas–van Alphen Experiment and Fermi Surface Properties in Field-Induced Ferromagnetic State of MnP

Kawakatsu Shoya, Kakihana Masashi, Nakashima Miho, Amako Yasushi, Nakamura Ai, Aoki Dai, Takeuchi Tetsuya, Harima Hisatomo, Hedo Masato, Nakama Takao, Onuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 4 ) 044705 - 044705   2019年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Anomalous ferromagnetic ordering in EuCuP

W. Iha, M. Kakihana, S. Matsuda, F. Honda, Y. Haga, T. Takeuchi, M. Nakashima, Y. Amako, J. Gouchi, Y. Uwatoko, M. Hedo, T. Nakama, Y. Ōnuki

Journal of Alloys and Compounds ( Elsevier )  788   361 - 366   2019年02月 [ 査読有り ]

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Lattice Modulation and Structural Phase Transition in the Antiferromagnet EuAl₄

Shimomura Susumu, Murao Hiroki, Tsutsui Satoshi, Nakao Hironori, Nakamura Ai, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( The Physical Society of Japan )  88 ( 1 ) 014602 - 014602   2018年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Superconducting and fermi surface properties of pyrite-type compounds CuS₂and CuSe₂

Masashi Kakihana, Tatsuma D. Matsuda, Ryuji Higashinaka, Dai Aoki, Ai Nakamura, Hisatomo Harima, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 1 ) 014702   2018年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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De Haas–van Alphen Oscillations for Small Electron Pocket Fermi Surfaces and Huge H-linear Magnetoresistances in Degenerate Semiconductors PbTe and PbS

Kawakatsu Shoya, Nakaima Kenri, Kakihana Masashi, Yamakawa Yui, Miyazato Hayato, Kida Takanori, Tahara Time, Hagiwara Masayuki, Takeuchi Tetsuya, Aoki Dai, Nakamura Ai, Tatetsu Yasutomi, Maehira Takahiro, Hedo Masato, Nakama Takao, Onuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 1 ) 013704 - 013704   2018年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Electronic States of Antiferromagnet FeSn and Pauli Paramagnet CoSn

Kakihana Masashi, Nishimura Kengo, Aoki Dai, Nakamura Ai, Nakashima Miho, Amako Yasushi, Takeuchi Tetsuya, Kida Takanori, Tahara Time, Hagiwara Masayuki, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( The Physical Society of Japan )  88 ( 1 ) 014705   2018年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Unique Helical Magnetic Order and Field-Induced Phase in Trillium Lattice Antiferromagnet EuPtSi

Kaneko Koji, Frontzek Matthias D., Matsuda Masaaki, Nakao Akiko, Munakata Koji, Ohhara Takashi, Kakihana Masashi, Haga Yoshinori, Hedo Masato, Nakama Takao, Onuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  88 ( 1 ) 013702 - 013702   2018年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Magnetic properties of the itinerant A- type antiferromagnet CaCo₂P₂ studied by ⁵⁹Co and ³¹P nuclear magnetic resonance

N. Higa, Q.-P. Ding, A. Teruya, M. Yogi, M. Hedo, T. Nakama, Y. Ōnuki, Y. Furukawa

Physical Review B ( American Physical Society )  98 ( 18 ) 184433 - 184433   2018年11月 [ 査読有り ]

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Microscopic Observation of Heavy Quasiparticle Formation in the Intermediate Valence Compound EuNi₂P₂: ³¹P NMR Study

Higa Nonoka, Yogi Mamoru, Kuroshima Hiroko, Toji Tatsuki, Niki Haruo, Hiranaka Yuichi, Nakamura Ai, Nakama Takao, Hedo Masato, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  87 ( 9 ) 094708 - 094708   2018年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effects of Magnetic Field and Pressure on the Valence-Fluctuating Antiferromagnetic Compound EuPt₂Si₂

Takeuchi Tetsuya, Yara Tomoyuki, Ashitomi Yousuke, Iha Wataru, Kakihana Masashi, Nakashima Miho, Amako Yasushi, Honda Fuminori, Homma Yoshiya, Aoki Dai, Uwatoko Yoshiya, Kida Takanori, Tahara Time, Hagiwara Masayuki, Haga Yoshinori, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  87 ( 7 ) 074709 - 074709   2018年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Electronic States in EuCu₂(Ge_1−xSi_x)₂ Based on the Doniach Phase Diagram

Iha Wataru, Yara Tomoyuki, Ashitomi Yousuke, Kakihana Masashi, Takeuchi Tetsuya, Honda Fuminori, Nakamura Ai, Aoki Dai, Gouchi Jun, Uwatoko Yoshiya, Kida Takanori, Tahara Time, Hagiwara Masayuki, Haga Yoshinori, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( The Physical Society of Japan )  87 ( 6 ) 064706 - 064706   2018年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Microscopic evidence for magnetic ordering in NdCu₃Ru₄O₁₂: ^63,65Cu nuclear quadrupole resonance study

M. Yogi, H. Niki, M. Hedo, S. Komesu, T. Nakama

Physica B: Condensed Matter   536   342 - 345   2018年05月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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Giant Hall Resistivity and Magnetoresistance in Cubic Chiral Antiferromagnet EuPtSi

Kakihana Masashi, Aoki Dai, Nakamura Ai, Honda Fuminori, Nakashima Miho, Amako Yasushi, Nakamura Shota, Sakakibara Toshiro, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( The Physical Society of Japan )  87 ( 2 ) 023701 - 023701   2017年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fermi surfaces properties of AuAl₂, AuGa₂, and AuIn₂ with the CaF₂-type cubic structure

Nishimura K.

Physica B: Condensed Matter ( Elsevier )  536   588 - 596   2017年10月 [ 査読有り ]

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Pressure-induced valence change and moderate heavy fermion state in Eu-compounds

F. Honda, K. Okauchi, Y. Sato, A. Nakamura, H. Akamine, Y. Ashitomi, M. Hedo, T. Nakama, T. Takeuchi, J. Valenta, J. Prchal, V. Sechovsky, D. Aoki, Y. Ōnuki

Physica B: Condensed Matter ( Elsevier )  536   182 - 191   2017年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Small Fermi surfaces of PtSn₄ and Pt₃In₇

T. Yara, M. Kakihana, K. Nishimura, M. Hedo, T. Nakama, Y. Ōnuki, H. Harima

Physica B: Condensed Matter ( Elsevier )  536   625 - 633   2017年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Magnetic properties and effect of pressure on the electronic state of EuCo₂Ge₂

Y. Ashitomi, M. Kakihana, F. Honda, A. Nakamura, D. Aoki, Y. Uwatoko, M. Nakashima, Y. Amako, T. Takeuchi, T. Kida, T. Tahara, M. Hagiwara, Y. Haga, M. Hedo, T. Nakama, Y. Ōnuki

Physica B: Condensed Matter ( Elsevier )  536   192 - 196   2017年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fermi surfaces of the pyrite-type cubic AuSb₂ compared with split Fermi surfaces of the ullmannite-type cubic chiral NiSbS and PdBiSe

K. Nishimura, M. Kakihana, A. Nakamura, D. Aoki, H. Harima, M. Hedo, T. Nakama, Y. Ōnuki

Physica B: Condensed Matter ( Elservier )  536   643 - 648   2017年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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NMR studies of the helical antiferromagnetic compound EuCo₂P₂

N. Higa, Q.-P. Ding, F. Kubota, H. Uehara, M. Yogi, Y. Furukawa, N.S. Sangeetha, D.C. Johnston, A. Nakamura, M. Hedo, T. Nakama, Y. Ōnuki

Physica B: Condensed Matter ( Elsevier )  536   384 - 387   2017年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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NMR studies of the incommensurate helical antiferromagnet EuCo₂P₂: Determination of antiferromagnetic propagation vector

N. Higa, Q.-P. Ding, M. Yogi, N. S. Sangeetha, M. Hedo, T. Nakama, Y. Ōnuki, D. C. Johnston, Y. Furukawa

Physical Review B ( American Physical Society )  96 ( 2 ) 024405 - 024405   2017年07月 [ 査読有り ]

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Single Crystal Growth and Superconductivity in La₇Ni₃ without Inversion Symmetry in the Crystal Structure

A. Nakamura, F. Honda, Y. Homma, D. X. Li, K. Nishimura, M. Kakihana, M. Hedo, T. Nakama, Y. Ōnuki, D. Aoki

Journal of Physics: Conference Series ( IOP Publishing )  807 ( 5 ) 052012 - 052012   2017年04月 [ 査読有り ]

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Pressure Evolution of Characteristic Electronic States in EuRh₂Si₂ and EuNi₂Ge₂

F. Honda, K. Okauchi, A. Nakamura, D. Aoki, H. Akamine, Y. Ashitomi, M. Hedo, T. Nakama. Y. Ōnuki

Journal of Physics: Conference Series ( IOP Publishing )  807 ( 2 ) 022004 - 022004   2017年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fermi Surface and Magnetic Properties in Ferromagnet CoS₂ and Paramagnet CoSe₂ with the Pyrite-type Cubic Structure

A Teruya, F Suzuki, D Aoki, F Honda, A Nakamura, M Nakashima, Y Amako, H Harima, K Uchima, M. Hedo, T. Nakama, Y. Ōnuki

Journal of Physics: Conference Series ( IOP Publishing )  807 ( 1 ) 012001 - 012001   2017年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Unique Pressure versus Temperature Phase Diagram for Antiferromagnets Eu₂Ni₃Ge₅ and EuRhSi₃

Nakashima Miho, Amako Yasushi, Matsubayashi Kazuyuki, Uwatoko Yoshiya, Nada Masato, Sugiyama Kiyohiro, Hagiwara Masayuki, Haga Yoshinori, Takeuchi Tetsuya, Nakamura Ai, Akamine Hiromu, Tomori Keisuke, Yara Tomoyuki, Ashitomi Yosuke, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  86 ( 3 ) 34708 - 34708   2017年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Unique Electronic States in Non-centrosymmetric Cubic Compounds

M. Kakihana, K. Nishimura, Y. Ashitomi, T. Yara, D. Aoki, A. Nakamura, F. Honda, M. Nakashima, Y. Amako, Y. Uwatoko, T. Sakakibara, S. Nakamura, T. Takeuchi, Y. Haga, E. Yamamoto, H. Harima, M. Hedo, T. Nakama, Y. Ōnuki

Journal of Electronic Materials ( Springer )  46 ( 6 ) 3572 - 3584   2017年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Magnetic Structure of Divalent Europium Compound EuGa₄ Studied by Single-Crystal Time-of-Flight Neutron Diffraction

Kawasaki Takuro, Kaneko Koji, Nakamura Ai, Aso Naofumi, Hedo Masato, Nakama Takao, Ohhara Takashi, Kiyanagi Ryoji, Oikawa Kenichi, Tamura Itaru, Nakao Akiko, Munakata Koji, Hanashima Takayasu, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 11 ) 114711 - 114711   2016年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Magnetic Structure of Divalent Europium Compound EuGa₄ Studied by Single-Crystal Time-of-Flight Neutron Diffraction

Kawasaki Takuro, Kaneko Koji, Nakamura Ai, Aso Naofumi, Hedo Masato, Nakama Takao, Ohhara Takashi, Kiyanagi Ryoji, Oikawa Kenichi, Tamura Itaru, Nakao Akiko, Munakata Koji, Hanashima Takayasu, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 11 ) 114711 - 114711   2016年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Superconducting, Fermi surface, and magnetic properties in SrTGe₃ and EuTGe₃ (T: transition metal) with the Rashba-type tetragonal structure

M. Kakihana, H. Akamine, K. Tomori, K. Nishimura, A. Teruya, A. Nakamur, F. Honda, D. Aoki, M. Nakashima, Y. Amako, K. Matsubayashi, Y. Uwatoko, T. Takeuchi, T. Kida, M. Hagiwara, Y. Haga, E. Yamamoto, H. Harima, M. Hedo, T. Nakama, Y. Ōnuki

Journal of Alloys and Compounds ( Elservier )  694   439 - 451   2016年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Calorimetry Study of the Phase Diagrams of EuNi2Ge2 and Eu2Ni3Ge5 under Pressure

Muthu Sankaran Esakki, Braithwaite Daniel, Salce Bernard, Nakamura Ai, Hedo Masato, Nakama Takao, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85 ( 9 )   2016年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Divalent, trivalent, and heavy fermion states in Eu compounds

Y. Ōnuki, A. Nakamura, F. Honda, D Aoki, T. Tekeuchi, M. Nakashima, Y. Amako, H. Harima, K. Matsubayashi, Y. Uwatoko, S. Kayama, T. Kagayama, K. Shimizu, Esakki S Muthu, D. Braithwaite, B. Salce, H. Shiba, T. Yara, Y. Ashitomi, H. Akamine, K. Tomori, M. Hedo, T. Nakama

Philosophical Magazine ( Philosophical Magazine )  97 ( 36 ) 3399 - 3414   2016年08月 [ 査読有り ]

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Electronic Structure of EuAl₄ Studied by Photoelectron Spectroscopy

Kobata Masaaki, Fujimori Shin-ichi, Takeda Yukiharu, Okane Tetsuo, Saitoh Yuji, Kobayashi Keisuke, Yamagami Hiroshi, Nakamura Ai, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 9 ) 094703 - 094703   2016年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Magnetic and Fermi Surface Properties of Ferromagnets EuPd₂ and EuPt₂

Nakamura Ai, Akamine Hiromu, Ashitomi Yousuke, Honda Fuminori, Aoki Dai, Takeuchi Tetsuya, Matsubayashi Kazuyuki, Uwatoko Yoshiya, Tatetsu Yasutomi, Maehira Takahiro, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 8 ) 84705 - 84705   2016年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Conducting Behavior and Valence Ordering of a One-Dimensional MMX-Type Coordination Polymer under High Pressure

K. Otsubo, T. Suto, A. Kobayashi, R. Ikeda, M. Hedo, Y. Uwatoko, H. Kitagawa

European Journal of Inorganic Chemistry ( Wiley Online Library )  2016 ( 27 ) 4402 - 4407   2016年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Large Cyclotron Mass and Large Ordered Moment in Ferromagnet CoS₂ Compared with Paramagnet CoSe₂

Teruya Atsushi, Suzuki Fuminori, Aoki Dai, Honda Fuminori, Nakamura Ai, Nakashima Miho, Amako Yasushi, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 6 ) 064716 - 064716   2016年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Large Cyclotron Mass and Large Ordered Moment in Ferromagnet CoS₂ Compared with Paramagnet CoSe₂

Teruya Atsushi, Suzuki Fuminori, Aoki Dai, Honda Fuminori, Nakamura Ai, Nakashima Miho, Amako Yasushi, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 6 ) 064716 - 064716   2016年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Pressure-Induced Valence Transition and Characteristic Electronic States in EuRh₂Si₂

Honda Fuminori, Okauchi Keigo, Nakamura Ai, Li Dexin, Aoki Dai, Akamine Hiromu, Ashitomi Yousuke, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 6 ) 063701 - 063701   2016年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Superconducting and Fermi Surface Properties of Single Crystal Zr₂Co

Teruya Atsushi, Kakihana Masashi, Takeuchi Tetsuya, Aoki Dai, Honda Fuminori, Nakamura Ai, Haga Yoshinori, Matsubayashi Kazuyuki, Uwatoko Yoshiya, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  85 ( 3 ) 034706 - 034706   2016年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Characteristic Fermi surfaces and charge density wave in SrAl₄ and related compounds with the BaAl₄-type tetragonal structure

A. Nakamura, T. Uejo, H. Harima, S. Araki, T. C. Kobayashi, M. Nakashima, Y. Amako, M. Hedo, T. Nakama, Y. Ōnuki

Journal of Alloys and Compounds ( Elsevier )  654   290 - 299   2016年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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キュービックアンビルセルを用いた高圧力下でのEu化合物の価数揺動

辺土 正人, 屋良 朝之, 安次富 洋介, 中島 美帆, 天児 寧, 郷地 順, 上床 美也, 本多 史憲, 仲間 隆男, 大貫 惇睦

日本物理学会講演概要集 ( 一般社団法人 日本物理学会 )  71   2274 - 2274   2016年

掲載種別: 研究論文（その他学術会議資料等）

　概要を見る

<p>磁気秩序を示す Eu化合物は，一般的に圧力下で磁気転移温度が緩やかに上昇しつづけ，一部は一次転移の価数転移を示す。近年我々は Ce 化合物のように，磁気転移点が圧力によって低下し，磁気臨界点を向かう Eu化合物をいくつか見いだしている。本講演では，高圧下で磁気臨界点を迎える Eu_2_Ni_3_Ge_5_ や EuIr_2_Ge_2_ をキュービックアンビルセルを用いた高圧下電気抵抗測定によって，重い電子状態に移行していく電子状態を議論する。</p>

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Studies of ²⁷Al NMR in SrAl₄

Haruo Niki, Nonoka Higa, Hiroko Kuroshima, Tatsuki Tojia, Mach Morishima, Motofumi Minei, Mamoru Yogi, Ai Nakamura, Masato Hedo, Takao Nakama, Yoshichika Ōnuki, Hisatomo Harima

Physics Procedia ( Elsevier )  75   763 - 770   2015年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Pressure Effect on Transport Properties of EuNi(Si_1-xGe_x)₃ Compounds

Kiyoharu Uchima, Yoshinao Takaesua, Nozomi Arakaki, Sentaro Hirakawa, Masashi Kakihana, Yosuke Ashitomi, Kengo Nishimura, Fuminori Suzuki, Tomoyuki Yara, Masato Hedo, Takao Nakama, Katsuma Yagasaki, Kazuyui Matsubayashi, Yoshiya Uwatoko

Physics Procedia ( Elsevier )  75   884 - 889   2015年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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De Haas-van Alphen Effect and Fermi Surface Properties in Ferromagnet LaCo₂P₂ and Related Compounds

Atsushi Teruya, Ai Nakamura, Tetsuya Takeuchi, Fuminori Honda, Dai Aoki, Hisatomo Harima, Kiyoharu Uchima, Masato Hedo, Takao Nakama, Yoshichika Ōnuki

Physics Procedia ( Elsevier )  75   876 - 883   2015年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Transport and Magnetic Properties of EuAl₄ and EuGa₄

Nakamura Ai, Uejo Taro, Honda Fuminori, Takeuchi Tetsuya, Harima Hisatomo, Yamamoto Etsuji, Haga Yoshinori, Matsubayashi Kazuyuki, Uwatoko Yoshiya, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 12 ) 124711 - 124711   2015年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fermi Surface Properties Based on the Relativistic Effect in SrBi₃ with AuCu₃-Type Cubic Structure

Kakihana Masashi, Akamine Hiromu, Yara Tomoyuki, Teruya Atsushi, Nakamura Ai, Takeuchi Tetsuya, Hedo Masato, Nakama Takao, Ōnuki Yoshichika, Harima Hisatomo

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 12 ) 124702 - 124702   2015年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Split Fermi Surface Properties in Ullmannite NiSbS and PdBiSe with the Cubic Chiral Crystal Structure

Kakihana Masashi, Teruya Atsushi, Nishimura Kengo, Nakamura Ai, Takeuchi Tetsuya, Haga Yoshinori, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 9 ) 094711 - 094711   2015年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Pressure-Induced Valence Transition and Heavy Fermion State in Eu₂Ni₃Ge₅ and EuRhSi₃

Nakamura Ai, Okazaki Tomoya, Nakashima Miho, Amako Yasushi, Matsubayashi Kazuyuki, Uwatoko Yoshiya, Kayama Shuei, Kagayama Tomoko, Shimizu Katsuya, Uejo Taro, Akamine Hiromu, Hedo Masato, Nakama Takao, Ōnuki Yoshichika, Shiba Hiroyuki

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 5 ) 053701 - 053701   2015年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Characteristic Fermi Surface Properties of V₂Ga₅, CoGa₃, TiGa₃, ZrGa₃, and ZrAl₃ with Different Tetragonal Structures

Teruya Atsushi, Takeda Masataka, Nakamura Ai, Harima Hisatomo, Haga Yoshinori, Uchima Kiyoharu, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 5 ) 054703 - 054703   2015年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fermi Surface Properties of Eu-Divalent and Eu-Trivalent Electronic States with the AuCu₃ -type Cubic Structure

Nakamura, Ai, Takeuchi, Tetsuya, Tatetsu, Yasutomi, Maehira, Takahiro, Harima, Hisatomo, Hedo, Masato, Nakama, Takao, Ōnuki, Yoshichika

Journal of Physics: Conference Series   592   012048   2015年03月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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  DOI

Split Fermi Surface Properties based on the Relativistic Effect in Superconductor PdBiSe with the Cubic Chiral Crystal Structure

Kakihana Masashi, Nakamura Ai, Teruya Atsushi, Harima Hisatomo, Haga Yoshinori, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 3 ) 33701 - 1-4   2015年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Effect of pressure on the electronic state in Eu-Divalent EuTIn₄ (T: Ni, Pd, Pt, Au) compounds

M. Hedo, Y. Hiranaka, A. Nakamura, K. Tomori, F. Honda, Y. Haga, H. Harima, K. Matsubayashi, Y. Uwatoko, T. Nakama, Y. Ōnuki

Journal of Physics: Conference Series ( IOP Publishing )  592 ( 1 ) 012047 - 012047   2015年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Mass Enhancement of Nearly Trivalent Compound EuCo2Si2: Studied by the de Haas-van Alphen Experiments and Energy Band Calculations

Onuki Yoshichika, Nakamura Ai, Aoki Dai, Boukahil Mounir, Haga Yoshinori, Takeuchi Tetsuya, Harima Hisatomo, Hedo Masato, Nakama Takao

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014)   592   2015年 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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De Haas–van Alphen Effect in Rh₂Ga₉ and Ir₂Ga₉ without Inversion Symmetry in the Crystal Structure and Related Compounds T₂Al₉ (T: Co, Rh, Ir) with Inversion Symmetry

Takeda Masataka, Teruya Atsushi, Nakamura Ai, Harima Hisatomo, Hedo Masato, Nakama Takao, Ōnuki Yoshichika

Journal of the Physical Society of Japan ( Physical Society of Japan )  84 ( 2 ) 024701 - 024701   2014年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Contribution of J-Multiplet Levels to the Physical Properties of EuPd3 with the Trivalent Electronic State

Takeuchi Tetsuya, Nakamura Ai, Hedo Masato, Nakama Takao, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 11 )   2014年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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De Haas-van Alphen Effect and Fermi Surface Properties in Nearly Ferromagnet SrCo2P2

Teruya Atsushi, Nakamura Ai, Takeuchi Tetsuya, Harima Hisatomo, Uchima Kiyoharu, Hedo Masato, Nakama Takao, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 11 )   2014年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Studies of Ga NMR and NQR in SrGa₄

H. Niki, N. Higa, S. Nakamura, H. Kuroshima, T. Toji, M. Yogi, A. Nakamura, M. Hedo, T. Nakama, Y. Ōnuki, H. Harima

Hyperfine Interactions ( Springer )  231 ( 1-3 ) 57 - 64   2014年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Antiferromagnetic Order of EuGa4 Probed by Mössbauer Spectroscopy

Yoshiya Homma, Ai Nakamura, Yusuke Hirose, Masato Hedo, Takao Nakama, Dexin Li, Fuminori Honda, Yoshichika Ōnuki, Dai Aoki

JPS Conference Proceedings, Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)   3   011082-1 - 011082-6   2014年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Chiral-Structure-Driven Split Fermi Surface Properties in TaSi2, NbSi2, and VSi2

Onuki Yoshichika, Nakamura Ai, Uejo Taro, Teruya Atsushi, Hedo Masato, Nakama Takao, Honda Fuminori, Harima Hisatomo

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 6 )   2014年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effects of Pressure and Magnetic Field on Transport Properties of EuCo2P2

Dai Nakamura, Masato Hedo, Kiyoharu Uchima, Yoshinao Takasu, Takao Nakama, Katsuma Yagasaki, Tetsuya Fujiwara, Toru Shigeoka, Yoshiya Uwatoko

Journal of the Physical Society of Japan, Conf. Proc. 3   3   01700-1 - 4   2014年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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De Haas-van Alphen Effect and Fermi Surface Properties of EuPd3 with the Trivalent Electronic State

Nakamura Ai, Takeuchi Tetsuya, Harima Hisatomo, Hedo Masato, Nakama Takao, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 5 )   2014年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Charge Density Wave Transition in EuAl4

Araki Shingo, Ikeda Yoichi, Kobayashi Tatsuo C., Nakamura Ai, Hiranaka Yuichi, Hedo Masato, Nakama Takao, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83 ( 1 )   2014年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Chiral-Structure-Driven Split Fermi Surface Properties in TaSi2, NbSi2, and VSi2

大貫 惇睦, 辺土 正人

Journal of the Physical Society of Japan   83   2014年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  CiNii Research

Fermi Surface and Magnetic Properties of Ferromagnet EuRu2P2

Hedo, Masato, Miura, Yasunao, Mori, Akinobu, Tsutsumi, Hiroki, Hirose, Yusuke, Honda, Fuminori, Takeuchi, Tetsuya, Nakamura, Ai, Hiranaka, Yuichi, Nakama, Takao, Harima, Hisatomo, Ōnuki, Yoshichika

JPS Conf. Proc. ( Journal of the Physical Society of Japan )  82 ( 12 )   2014年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

EuBi3 with the AuCu3-type cubic structure is known to be a Eu-divalent antiferromagnet with the Neel temperature T-N similar or equal to 7.5 K. We succeeded in growing a high-quality single crystal by the Bi self-flux method. The magnetization at 1.3 K for the magnetic field along the < 100 > direction increases linearly as a function of magnetic field, and saturates at a critical field H-c = 225 kOe, reaching a saturated magnetic moment of 7 mu(B)/Eu. H-c is well explained by the magnetic exchange interaction based on a two-sublattice model, using the simple relation H-c = (k(B)/3 mu(B))(T-N - theta(p))(,) namely, H-c [kOe] = 4.9 (T-N - theta(p)) [K], where theta(p) is the paramagnetic Curie temperature theta(p) = -36 K. The present antiferromagnetic state is found to be stable under pressures up to 8 GPa, where the Neel temperature increases with increasing pressure, being T-N = 16.5 K at 8 GPa. From the results of de Haas-van Alphen experiments on EuBi3 and energy band calculations for the non-4f reference compound SrBi3, the Fermi surface is found to consist of three types of nearly spherical Fermi surfaces.

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Chiral Crystal Structure and Split Fermi Surface Properties in TaSi2

Nakamura Ai, Harima Hisatomo, Hedo Masato, Nakama Takao, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   82 ( 11 )   2013年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effect of partial magnetic order on resistivity and thermopower of Ho(Co1-x Al (x) )(2) alloys

Nakama T., Zukeran C., Nakamura A., Teruya A., Hirakawa S., Watanabe S., Hiranaka Y., Takeda M., Hedo M., Yagasaki K., Takaesu Y., Uchima K., Burkov A. T.

JOURNAL OF THE KOREAN PHYSICAL SOCIETY   63 ( 3 ) 372 - 376   2013年08月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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Pressure and Substitution Effects on Transport and Magnetic Properties of Y1-xRxCo2 Systems with Static Magnetic Disorder

Takeda Masataka, Teruya Atsushi, Watanabe Shintaro, Hirakawa Sentaro, Hiranaka Yuichi, Nakamura Ai, Takaesu Yoshinao, Uchima Kiyoharu, Hedo Masato, Nakama Takao, Yagasaki Katsuma, Matsubayashi Kazuyuki, Uwatoko Yoshiya, Burkov Alexander T.

J Phys Soc Jpn ( The Physical Society of Japan )  82 ( 1 ) 14708 - 014708-6   2013年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The electrical resistivity and thermopower of light- and heavy-rare-earth-based pseudo-binary Y1-xRxCo2 (R = Nd, Gd, and Tb) alloys are measured at temperatures from 2 to 300 K under pressures up to 3.5 GPa. The resistivity and thermopower of Y1-xRxCo2 show unusual large variations with atomic substitution and pressure in the range of x<x_{\text{m } }, where an inhomogeneous magnetization of the Co 3d electron subsystem is observed. These results indicate that the low-temperature transport properties of Y1-xNdxCo2, as well as of Y1-xR\text{HCo2 (R\text{H = heavy rare earth) alloys, are related to conduction electron scattering due to the static magnetic disorder in the itinerant Co 3d electron subsystem. We found that there is a universal relationship between \mathrm{d}\ln T_{\text{C } }/\mathrm{d}P and x/x_{\text{m } } in Y1-xRxCo2 alloys, where x_{\text{m } } is the boundary composition, which separates the alloy phase diagram into regions with uniform and nonuniform magnetizations of the Co-3d electron subsystem.

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Anisotropy of Upper Critical Field in a One-Dimensional Organic System, (TMTTF)(2)PF6 under High Pressure

Kano Mika, Mori Hatsumi, Matsubayashi Kazuyuki, Itoi Miho, Hedo Masato, Murphy Timothy P., Tozer Stanley W., Uwatoko Yoshiya, Nakamura Toshikazu

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   81 ( 2 )   2012年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Anomalous magnetic response of CeRu2

D. Pal, S. Ramakrishnan, A. K. Grover, E. Yamamoto, Y. Haga, M. Hedo, Y. Inada, Y. Onuki

25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 5 ( IOP PUBLISHING LTD )  150   2009年 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

　概要を見る

Long ago S. B. Roy and co-workers had explored the appearance of anomalous paramagnetic response in the magnetization data near the H-c2 phase boundary in samples of CeRu2. Recently, an anomalous paramagnetic response has also been demonstrated in a Borocarbide superconductor LuNi2B2C, where the phenomenon has been related to the symmetry transition of the flux line lattice. We report here the magnetization data from vibrating sample magnetometer in a single crystal of CeRu2. We demonstrate that the magnetization profile is dipolar like only at very low fields and as the applied field increases it gets drastically modified. The presence of quadrupole moment along with the dipole moment is needed to justify such a magnetization profile. We report that the quadrupole moment undergoes a large modulations near the H-c2 phase boundary. Hence, there is a possibility of response from quadrupole moment getting mixed with that from dipolar response which might lead to paramagnetic anomaly prior to H-c2.

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Anomalously wide superconducting phase of one-dimensional organic conductor (TMTTF)(2)SbF6

Itoi Miho, Araki Chieko, Hedo Masato, Uwatoko Yoshiya, Nakamura Toshikazu

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 2 )   2008年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Anomalous pressure dependence of superconductivity in layered organic conductor, K-(BEDT-TTF)(4)Hg2.89Br8

Taniguchi Hiromi, Okuhata Takahiro, Nagai Takuya, Satoh Kazuhiko, Mori Nobuo, Shimizu Yasuhiro, Hedo Masato, Uwatoko Yoshiya

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 11 )   2007年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Development of heat capacity measurement system under high pressure

Tomioka Furmaki, Umehara Izuru, Ono Takashi, Hedo Masato, Uwatoko Yoshiya, Kimura Noriaki

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 5A ) 3090 - 3095   2007年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Chemical pressure effect in the heavy fermion compound Ce1yLay(Ru0.85Rh0.15)(2)Si-2

Horii Tsuyoshi, Shimada Satomi, Nakano Tomohito, Murayama Shigeyuki, Takano Hideaki, Hedo Masato, Uwatoko Yoshiya

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 ) 313 - 315   2007年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effect of pressure on the magnetization measurements of Fe2P

L. Chen, N. Kurita, T. Fujiwara, M. Abliz, M. Hedo, I. Oguro, A. Matsuo, K. Kindo, Uwatoko, H. Fujii

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS ( ELSEVIER SCIENCE BV )  310 ( 2 ) E219 - E221   2007年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The ferromagnetic compound Fe2P shows a first-order paramagnetic to ferromagnetic transition at T-C = 209 K. To investigate the magnetic properties of this compound under high pressures above 3 GPa, it has been tried to measure the magnetization using a diamond anvil type high-pressure apparatus by MPMS (quantum design). As the results of trial and error, we have succeeded to obtain the data with sufficient precision to understand the substantial behavior of the compound even under considerable high pressures above 5.0 GPa. (c) 2006 Elsevier B.V. All rights reserved.

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Pressure effect of electrical resistivity and AC specific heat in CePtAl

Nakashima M, Ueda T, Shimizu K, Nakashima H, Thamizhavel A, Tateiwa N, Haga Y, Hedo M, Uwatoko Y, Settai R, Onuki Y, Izawa K, Knebel G, Salce B, Flouquet J

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 ) E9 - E11   2007年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Conference proceedings, ICM 2006

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  DOI

Effect of Hydrostatic Pressure on the Electrical resistivity of PrOs4Sb12 up to 10 GPa

Kurita Nobuyuki, Hedo Masato, Kano Mika, Uwatoko Yoshiya, Fujiwara Tetsuya, Tozer Stanley W.

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76   150 - 151   2007年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Magnetic Behavior of TmTe at High Pressure

Chen Lin, Kurita Nobuyuki, Hedo Masato, Nakazawa Kazuko, Oguro Isamu, Uwatoko Yoshiya, Matsumura Takeshi, Tokumoto Madoka, Tozer Stanley W.

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76   58 - 59   2007年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Electrical resistivity in SmCoIn₅ under high pressure

Koeda, M; Hedo, M; Fujiwara, T; Uwatoko, Y; Sadamasa, T; Inada, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( The Physical Society of Japan )  76   62 - 63   2007年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Pressure Effect of Electronic States in Antiferromagnets CeTX₃ (T: Transition metal, X: Si and Ge)

Kawai, T; Nakashima, M; Okuda, Y; Shishido, H; Shimoda, T; Matsuda, TD; Haga, Y; Takeuchi, T; Hedo, M; Uwatoko, Y; Settai, R; Onuki, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( The Physical Society of Japan )  76   166 - 167   2007年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Electrical Resistivity Measurements on PrPb₃ under High Pressures

Kano, M; Kurita, N; Hedo, M; Uwatoko, Y; Tozer, SW; Suzuki, HS; Onimaru, T; Sakakibara, T

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( The Physical Society of Japan )  76   56 - 57   2007年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Electrical Resistivity of (TMTTF)₂PF₆under High Pressure

Araki Chieko, Itoi Miho, Hedo Masato, Uwatoko Yoshiya, Mori Hatsumi

Journal of the Physical Society of Japan ( The Physical Society of Japan )  76   2007年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Electrical conducting bis(oxalato)platinate complex with direct connection of Cu<SUP>II</SUP> ions

Yamamoto, C; Nishikawa, H; Nihei, M; Shiga, T; Hedo, M; Uwatoko, Y; Sawa, H; Kitagawa, H; Taguchi, Y; Iwasa, Y; Oshio, H

INORGANIC CHEMISTRY ( AMER CHEMICAL SOC )  45 ( 25 ) 10270 - 10276   2006年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Reactions of K-1.62[Pt(ox)(2)]center dot 2H(2)O and [Cu(bpy)(H2O)(3)](NO3)(2) yielded partially oxidized one-dimensional (1D) bis(oxalato)platinates of [Cu(bpy)(H2O)(n)](6)[Pt(ox)(2)](7)center dot 7H(2)O (n = 2, 3, or 4) (1) and [Cu(bpy)(H2O)(n)](8)[Pt(ox)(2)](10)center dot 8H(2)O (n = 3 or 4) (2). The average oxidation numbers of the platinum ions in 1 and 2 are +2.29 and +2.40, respectively. Complexes 1 and 2 crystallize in the triclinic P (1) over bar and monoclinic C2/c space groups, respectively, and the [Pt(ox)(2)](n-) anions are stacked along the crystallographic b axis with 7-fold periodicity for 1 and 10-fold periodicity for 2. In 1, an oxalato ligand in the platinum chain directly coordinates to a paramagnetic [Cu(bpy)(H2O)(3)](2+) ion, whereas no such direct coordination was observed for 2. The electrical conductivity of 2 at room temperature along the platinum chain is approximately 3 orders of magnitude smaller (sigma(II) = 1.3 x 10(-3) S cm(-1)) than that of 1(sigma(II) = 0.9-0.5 S cm(-1)), and the activation energies of 1 and 2 are 29 and 67 meV, respectively. The longest inter-platinum distances in 1 and 2 are 2.762 and 3.0082 angstrom, respectively, and this is responsible for the lower electrical conductivity of 2. An X-ray oscillation photograph taken along the b axis of 1 reveals the 7-fold periodicity in the 1D chain, consistent with the period of the Peierls distortion estimated from the degree of partial oxidation. The semiconducting state of 1 can therefore be regarded as a commensurate Peierls state. The magnetoresistance of 1 at ambient pressure indicates no interaction between conduction electrons in the platinum chain and local spins of the paramagnetic Cu-II ions. Application of hydrostatic pressures of up to 3 GPa enhances electrical conduction, as is often seen as the usual pressure effect on the electrical conductivity, which is due to enhanced orbital (Pt-5d(z)(2)) overlap by pressure application.

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  DOI
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  PubMed

Effect of pressure on the electronic state in antiferromagnets UPt2Si2 and UIr2Si2

Ikeda Shugo, Nakashima Miho, Matsuda Tatsuma D., Tateiwa Naoyuki, Yamamoto Etsuji, Nakamura Akio, Haga Yoshinori, Hedo Masato, Uwatoko Yoshiya, Onuki Yoshichika

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   75 ( 12 )   2006年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Pressure effect on electrical resistivity of Y_1-<i>x</i>Gd<i>_x</i>Co₂

Nakama, T; Takaesua, Y; Yagasaki, K; Sakai, E; Kurita, N; Hedo, M; Uwatoko, Y; Burkov, AT

PHYSICA B-CONDENSED MATTER ( Physica B: Condensed Matter )  378-80 ( SPEC. ISS. ) 169 - 170   2006年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Electrical resistivity of Y1-xGdxCo2 alloy system has been measured at temperatures from 2 to 300 K in magnetic field up to 15T and under pressure up to 10 GPa. The compounds with the composition near to phase boundary between paramagnetic and ferromagnetic ground state (x(c) approximate to 0.12) show strong enhancement of electrical resistivity at low temperatures. Large positive magnetoresistance was observed in ferromagnetic alloys in composition range 0.15 &lt; x &lt; 0.3. The anomalous magneto resistance as well as the composition dependence of the low-temperature resistivity were explained by an interplay of metamagnetic instability of Co 3d itinerant electrons and structural disorder within rare-earth sublattice. The pressure effect on electrical resistivity for Y1-xGdxCo2 at low temperatures is in agreement with the variation of magnetoresistance with the composition. (c) 2006 Elsevier B.V. All rights reserved.

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  DOI

Heat capacity measurement of CePd₂Si₂ under high pressure

Hashimoto, M; Tomioka, F; Umehara, I; Fujiwara, T; Hedo, M; Uwatoko, Y

PHYSICA B-CONDENSED MATTER ( ELSEVIER SCIENCE BV )  378-80 ( SPEC. ISS. ) 815 - 816   2006年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We have performed AC calorimetric measurement under high pressure tip to 1.56GPa using a Cu-Be and Ni-Cr-Al hybrid piston cylinder cell in the temperature range from 2 to 12K in CePd2Si2. It is clearly seen magnetic ordering temperature T-N, and magnetic contribution are suppressed under high pressures. (c) 2006 Elsevier B.V. All rights reserved.

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  DOI

Anomalous metallic state in (TTM-TTP)I-3 with a highly one-dimensional half-filled band under pressure beyond 7 GPa

Yasuzuka S., Murata Keizo, Fujimoto T., Shimotori M., Kawamoto T., Mori T., Hedo M., Uwatoko Y.

JOURNAL OF LOW TEMPERATURE PHYSICS   142 ( 3-4 ) 197 - 200   2006年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Evolution of Hall coefficient in two-dimensional heavy fermion CeCoIn₅

Nakajima, Y; Izawa, K; Matsuda, Y; Behnia, K; Kontani, H; Hedo, M; Uwatoko, Y; Matsumoto, T; Shishido, H; Settai, R; Onuki, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( PHYSICAL SOC JAPAN )  75 ( 2 )   2006年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We report on the pressure dependence of the Hall coefficient RH in quasi-2D heavy fermion CeCoIn5. At ambient pressure, below a temperature associated with the emergence of non-Fermi liquid properties, RH is anomalously enhanced. We found that the restoration of the Fermi liquid state with applied pressure leads to a gradual suppression of this dramatic enhancement. Moreover, the enhancement in RH was found to be confined to an intermediate temperature window, where inelastic electron-electron scattering is dominant. Our results strongly support the presence of cold and hot spots on the Fermi surface probably due to anisotropic scattering by antiferromagnetic fluctuations, which may also prove relevant for the debate on the anomalous normal-state properties of high-T-c cuprates.

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Electrical properties of the dialkyldimethylammomium-Au(dmit)(2) LB films

Masaaki Kitao, Hawki Matsui, Shin-ichi Morita, Yasuhiro F. Miura, Michio Sugi, Masato Hedo, Yoshiya Uwatoko

Transactions of the Materials Research Society of Japan, Vol 31, No 3 ( ELSEVIER SCIENCE BV )  31 ( 3 ) 621 - 624   2006年 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

　概要を見る

The resistance of the Langmuir-Blodgett films based on ditetradecyldimethylammonium-Au(dmit)2 (2C(14)-Au(dmit)(2)) salt was measured along the film plane using electrode gaps of 0.5 turn and 5 mu m in a wide temperature range of 27-290 K. In case the electrode gap is 0.5 mm, the LB film shows a weak metallic behavior from room temperature down to around 200-250 K with a positive temperature derivative of the resistance, but it shows a negative temperature derivative of the resistance below the temperature. However, in case the electrode gap is 5 mu m, the metallic temperature dependence of the resistance extends down to the lower temperature range of 58-106 K. The atomic force microscopy (AFM) has revealed that the LB film consists of crystallites, which are 1-5 mu m in lateral sizes and 4-20 nm in thickness. We hypothesize that the broad minimum of the resistance vs. temperature plot emerges in a crossover region, where metallic nature inside the crystallites are competing with the random potentials set up by grain boundaries and/or defects, and then, the metallic temperature dependence extends down to the lower temperature by narrowing the electrode gap.

Charge density wave and pressure-induced reentrant superconductivity in ZrTe3

Yamaya K, Yomo R, Inagaki K, Tanda S, Abliz M, Hedo M, Uwatoko Y

JOURNAL DE PHYSIQUE IV   131   343 - 345   2005年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effect of pressure on electronic states in canted ferromagnet CePtAl

Ueda T, Nakashima M, Hedo M, Uwatoko Y, Nakashima H, Thamizhavel A, Matsuda TD, Haga Y, Settai R, Onuki Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 12 ) 3393 - 3394   2005年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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  DOI

Electrical resistivity of the perovskite Ba_1-<i>x</i>K<i>_x</i>BiO₃ (x ≤ 0.15) under high pressure

Imai, Y; Kato, M; Noji, T; Koike, Y; Hedo, M; Uwatoko, Y; Mori, N

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   426 ( I ) 497 - 499   2005年10月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

　概要を見る

Electrical resistivity measurements of the insulating Ba 1-xKxBiO3 (x = 0, 0.15) under high pressure up to 8 GPa have been performed in order to search for the pressure-induced superconductivity, using a cubic-anvil pressure system. A polycrystal of BaBiO3 has been prepared by the solid-state reaction method. A single crystal of Ba0.85K0.15BiO3 has been synthesized by the electrochemical method from molten salts. The electrical resistivity of both compounds slightly decreases with increasing pressure. However, the temperature dependence still remains semiconductive and no superconductivity is observed. © 2005 Elsevier B.V. All rights reserved.

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Effect of hydrostatic pressure on molecular conductors, Pd(dmit)(2) salts

Ishii Y, Tamura M, Kato R, Hedo M, Uwatoko Y, Mori N

SYNTHETIC METALS   152 ( 1-3 ) 389 - 392   2005年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A change of electronic state tuned by pressure: pressure-induced superconductivity of the antiferromagnet Ce2Ni3Ge5

Nakashima M, Kohara H, Thamizhavel A, Matsuda TD, Haga Y, Hedo M, Uwatoko Y, Settai R, Onuki Y

JOURNAL OF PHYSICS-CONDENSED MATTER   17 ( 28 ) 4539 - 4546   2005年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Electrical and magnetic properties of a single crystal UCu₂Si₂

Matsuda, TD; Haga, Y; Ikeda, S; Galatanu, A; Yamamoto, E; Shishido, H; Yamada, M; Yamaura, J; Hedo, M; Uwatoko, Y; Matsumoto, T; Tada, T; Noguchi, S; Sugimoto, T; Kuwahara, K; Iwasa, K; Kohgi, M; Settai, R; Onuki, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 5 ) 1552 - 1556   2005年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We have succeeded in growing a high-quality single crystal of UCu 2Si2 with the tetragonal structure by the Sn-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization and specific heat. UCu2Si2 is found to order antiferromagnetically below TN = 106 K, and follows a successive ferromagnetic ordering at TC = 100 K. The magnetic properties are highly anisotropic, reflecting the crystal structure. An easy-axis of magnetization is found to be the [001] direction (c-axis) both in the antiferromagnetic and ferromagnetic phases, while the [100] direction (a-axis) corresponds to the hard-axis in magnetization. The magnetization curve in the antiferromagnetic phase indicates a clear metamagnetic transition at a low field of about 1 kOe and changes into a ferromagnetic magnetization curve below TC = 100 K. The saturation moment is determined as 1.75 μB/U at 2 K. The electronic specific heat coefficient is also determined as 20 mJ/(K2·mol). ©2005 The Physical Society of Japan.

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Electrical resistivity and tunneling anomalies in CeCuAs₂

Sampathkumaran, EV; Ekino, T; Ribeiro, RA; Sengupta, K; Nakano, T; Hedo, M; Fujiwara, N; Abliz, M; Uwatoko, Y; Rayaprol, S; Doert, T; Jernetio, JPF

PHYSICA B-CONDENSED MATTER ( ELSEVIER SCIENCE BV )  359   108 - 110   2005年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The compound CeCuAs2 is found to exhibit negative temperature (T) coefficient of electrical resistivity (rho) under ambient pressure conditions in the entire T-range of investigation (45 mK-300 K), even in the presence of high magnetic fields. Preliminary tunneling spectroscopic measurements indicate the existence of a psuedo-gap at least at low temperatures, thereby implying that this compound could be classified as a Kondo semi-conductor, though rho(T) interestingly is not found to be of an activated type. (c) 2005 Elsevier B.V. All rights reserved.

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Electrical resistivity, specific heat and magnetic susceptibility of tetragonal CeGe_1.66

Nakano, T; Hedo, M; Uwatoko, Y

PHYSICA B-CONDENSED MATTER ( ELSEVIER SCIENCE BV )  359   284 - 286   2005年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Magnetic susceptibility, specific heat and electrical resistivity measurements have been carried out on polycrystalline specimens of CeGe1.66, forming in a tetragonal structure, which is derived from CeGe2 by creation of vacancies at the Ge site. A shoulder in susceptibility, a jump in specific heat and an inflection in resisitivity attributable to magnetic ordering are observed at 6.7 K. Furthermore, a rapid increase in susceptibility, another jump in specific heat and a rapid decrease in the resistivity due to the ferromagnetic ordering are observed below (T-C =) 5.3 K. The electronic specific heat coefficient gamma is estimated to be about mJ/molK(2) (c) 2005 Elsevier B.V. All rights reserved.

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Pressure dependence of the first-order superconducting phase transition in CeCoIn₅

Tayama, T; Namai, Y; Sakakibara, T; Hedo, M; Uwatoko, Y; Shishido, H; Settai, R; Onuki, Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( PHYSICAL SOC JAPAN )  74 ( 4 ) 1115 - 1118   2005年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The pressure dependence of the first-order phase transition (FOPT) at the upper critical field H-c2 in CeCoIn5 has been Studied by magnetization measurements. The FOPT is found to persist at pressures at least up to 1.5 GPa in the c axis and up to 1.38 GPa in the a axis. With increasing pressure, the anisotropy of H-c2 becomes stronger, and the condensation energy decreases significantly. We also observed a notable peak effect near H-c2 under pressure. Our results suggest that the FOPT cannot be accounted for by Pauli limiting alone.

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Pressure effect on competition between charge density wave and superconductivity in ZrTe₃:: Appearance of pressure-induced reentrant superconductivity -: art. no. 132508

Yomo, R; Yamaya, K; Abliz, M; Hedo, M; Uwatoko, Y

PHYSICAL REVIEW B   71 ( 13 )   2005年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We report on an intricate competition between charge density wave (CDW) formation and superconductivity under pressure up to 11 GPa in the low-dimensional conductor ZrTe3. As pressure increases, the CDW transition temperature TCDW initially increases, then begins to decrease at 2 GPa and abruptly disappears near 5 GPa. On the other hand, while the superconducting transition temperature TC falls to below 1.2 K at ∼0.5 GPa and is not observed at up to 5 GPa above 2.5 K, a superconducting transition emerges beginning at ∼5 GPa and TC increases steeply up to 11 GPa. This is an observation of pressure-induced reentrant superconductivity. The results are discussed in terms of the change in the reduced area of the Fermi surface due to CDW formation. © 2005 The American Physical Society.

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The development of a high pressure micro-cell for magnetization and specific heat measurements: the effect of pressure on the magnetism in CeAg

Uwatoko Y, Fujiwara T, Hedo M, Tomioka F, Umehara I

JOURNAL OF PHYSICS-CONDENSED MATTER   17 ( 11 ) S1011 - S1016   2005年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Altered Ru, Sr atomic environments in strontium ruthenates: XAFS evidence for valence and magnetism

Yoshimura M., Yoshida Y., Ikeda S. I., Shirakawa N., Nagai I., Hara S., Koyama K., Hedo M., Uwatoko Y.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E257 - E258   2004年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effect of pressure on the electrical resistivity of CeCu2Si2

Koeda Masahito, Hedo Masato, Uwatoko Yoshiya, Matsumoto Takehiko, Takeda Naoya, Ishikawa Masayasu

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   E175 - E176   2004年05月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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Design of micro pressure cell for measurements of specific heat and magnetization

Umehara I, Tomioka F, Tsuboi A, Ono T, Hedo M, Uwatoko Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   272   2301 - 2302   2004年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Pressure effect and temperature dependence of lattice constants for Ce(Ru_0.85Rh_0.15)₂Si₂

Koyama, K; Nakano, T; Hedo, M; Uwatoko, Y; Murayama, S

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS ( ELSEVIER SCIENCE BV )  272 ( 2 ) E109 - E110   2004年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

X-ray powder diffraction has been studied on Ce(Ru0.85Rh0.15)(2)Si-2 between 300 and 4 K under pressure up to 32 GPa with a diamond anvil cell, and the lattice constants and the bulk modulus have been obtained. The bulk modulus shows a rapid drop between 100 and 50 K; when the temperature decreases from 300 to 4 K: This tendency is most likely attributed to Kondo effect and/or a sign of a spin density wave. (C) 2003 Elsevier B. V. All rights reserved.

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Characterization of transport and magnetic properties of a Mott insulator, beta'-(BEDT-TTF)(2)IBrCI

Uchiyama K, Miyashita M, Taniguchi H, Satoh K, Mori N, Miyagawa K, Kanoda K, Hedo M, Uwatoko Y

JOURNAL DE PHYSIQUE IV   114   387 - 389   2004年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Characterization of transport and magnetic properties of a Mott insulator, beta'-(BEDT-TTF)(2)IBrCI

K Uchiyama, M Miyashita, H Taniguchi, K Satoh, N Mori, K Miyagawa, K Kanoda, M Hedo, Y Uwatoko

JOURNAL DE PHYSIQUE IV ( E D P SCIENCES )  114   387 - 389   2004年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Physical properties of an organic conductor, beta'-(BEDT-TTF)(2)IBrCl, were characterized under ambient and extremely high pressures. Semiconducting behavior with activation energy, E-a=0.11eV, and antiferromagnetic transition with T-N=19.5K were uncovered in the present work. In addition, we have found that this salt showed a sign of superconductivity at 8.0GPa in common with the case of the beta'-(BEDT-TTF)(2)ICl2, which is the highest-T-c superconductor among organics.

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Fermi-liquid instability of CeRh₂Si₂ near a pressure-induced quantum phase transition -: art. no. 144428

Ohashi, M; Oomi, G; Koiwai, S; Hedo, M; Uwatoko, Y

PHYSICAL REVIEW B   68 ( 14 )   2003年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The electrical resistivity of single crystalline CeRh2Si2 has been measured at high pressure up to 8 GPa, and low temperature down to 2.0 K for the current along the a and c axes. Two magnetic phase transitions TN1=35 K and TN2=24 K at ambient pressure were observed as a function of pressure. It is found that both transitions TN1 and TN2 are suppressed by applying pressure and disappear near the critical pressure at PC1∼1.0 GPa and PC2∼0.6 GPa, respectively. The transition for TN1 is second order and the one for TN2 is first order. The resistivity shows T2 dependence at low temperature in a wide pressure range from ambient pressure up to 8 GPa, indicating that a Fermi liquid state still exists near PC1 and PC2. According to the comparison between the coefficient of T2 term and the Sommerfeld coefficient γ, however, it is suggested that the enhancement of many-body dynamical effect occurs near the critical pressure PC1∼1.0 GPa. These results are discussed on the basis of the pressure-induced quantum phase transition. © 2003 The American Physical Society.

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Transport properties of the heavy-fermion superconductor Ce2CoIn8

Chen GF, Ohara S, Hedo M, Uwatoko Y, Sakamoto I

JOURNAL OF PHYSICS-CONDENSED MATTER   15 ( 28 ) S2175 - S2178   2003年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Electrical resistivity of single-crystal URhGe₂ under high pressure

Matsuda, TD; Ikeda, S; Haga, Y; Yamamoto, E; Hedo, M; Uwatoko, Y; Onuki, Y

JOURNAL OF PHYSICS-CONDENSED MATTER ( IOP PUBLISHING LTD )  15 ( 28 ) S2019 - S2021   2003年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We have measured the electrical resistivity under pressure for the orthorhombic ferromagnet URhGe2. Its two ferromagnetic ordering temperatures T-C2 = 30 K and T-C1 = 25 K exhibit different pressure dependences. T-C2 increases under pressure from 30 K at ambient pressure to 40 K at 6-8 GPa, while T-C1 decreases with increasing pressure and seems to vanish at around 8 GPa. URhGe2 is found to be ferromagnetic even at 8 GPa, and the values of A and rho(0) in the electrical resistivity expression rho = rho(0) + AT(2) are unchanged against pressure.

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Design of 4GPa class hybrid high pressure cell for dilution refrigerator

Uwatoko Y, Hedo M, Kurita N, Koeda M, Abliz M, Matsumoto T

PHYSICA B-CONDENSED MATTER   329   1658 - 1659   2003年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Development of AC susceptibility technique under high pressure and its application to organic superconductor

Kurita A, Miyashita M, Taniguchi H, Satoh K, Tamura M, Kato R, Hedo M, Uwatoko Y

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS   388   603 - 604   2003年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Pressure effect on Hall coefficient in multilayered high-T_c cuprates

Watanabe, T; Tokiwa, K; Moriguchi, M; Horike, R; Iyo, A; Tanaka, Y; Ihara, H; Ohashi, M; Hedo, M; Uwatoko, Y; Môri, N

JOURNAL OF LOW TEMPERATURE PHYSICS ( KLUWER ACADEMIC/PLENUM PUBL )  131 ( 3-4 ) 681 - 685   2003年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Temperature dependence of the Hall coefficient and the resistivity in Tl2Ba2CaCu2Oy (Tl-2212),Tl2Ba2Ca2Cu3Oy (Tk-2223) and Cu0.7C0.3Ba2Ca3Cu4Oy (Cu-1234) have been measured under high pressure up to 6 GPa. The values of the intrinsic T-c enhancement not related to charge transfer by applied pressure were estimated to be similar to0.8K/GPa for the Tl system and similar to1.1K/GPa for Cu-1234.

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Field effect on itinerant electron magnetism of Y_1-<i>x</i>Er<i>_x</i>CO₂ compounds

Nakama, T; Tokumura, M; Uchima, K; Hedo, M; Uwatoko, Y; Yagasaki, K; Burkov, AT

PHYSICA B-CONDENSED MATTER ( Physica B: Condensed Matter )  329 ( II ) 952 - 954   2003年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Thermopower S and electrical resistivity ρ of cubic Laves phase pseudo-binary compounds Y1-xErxCo2 were measured from 2 to 300 K in magnetic fields up to 15 T. S and ρ show a strong field dependence in a vicinity of the magnetic ordering temperature. The reduction of the exchange magnetic field Bexc acting on Co 3d electrons by Y substitution for Er results in a separation of magnetic transition temperatures of Er and Co subsystems in Y0.4Er 0.6Co2. The collapse of the itinerant Co 3d moments of Y0.4Er0.6Co2 is induced by applying external magnetic field about 10 T. © 2003 Elsevier Science B.V. All rights reserved.

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Possible superconductivity in metal(dmit)₂ Langmuir-Blodgett films

Miura, YF; Hedo, M; Uwatoko, Y; Saito, S; Sugi, M

SYNTHETIC METALS ( ELSEVIER SCIENCE SA )  137 ( 1-3 ) 1311 - 1312   2003年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The resistance of the Langmuir-Blodgen films of ditetradecyldimethylammonium-Au(dmit)(2) has been measured under hydrostatic pressure up to 0.7 GPa. The room-temperature resistance decreases with increasing pressure and reaches a 0.6-times smaller value compared to that at ambient pressure. The film under the pressure shows a clear resistance decrease below 1.4 K on cooling, while that under ambient pressure shows a blunt decrease below 0.85 K and it turns to increase below 0.65 K. These results suggest the existence of the pressure-induced superconducting phase together with the earlier results of the ac magnetic susceptibility measurement.

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Superconductivity at 14.2 K in layered organics under extreme pressure

Taniguchi H, Miyashita M, Uchiyama K, Satoh K, Mori N, Okamoto H, Miyagawa K, Kanoda K, Hedo M, Uwatoko Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 3 ) 468 - 471   2003年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Effect of pressure on electrical resistivity and lattice parameters of CeRh2Si2

Ohashi M, Oomi G, Koiwai S, Hedo M, Uwatoko Y

ACTA PHYSICA POLONICA B   34 ( 2 ) 1181 - 1184   2003年02月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

The restraint of valence transition in YbInCu4 by high pressure

Hedo M, Uwatoko Y, Matsumoto T, Sarrao JL, Thompson JD

ACTA PHYSICA POLONICA B   34 ( 2 ) 1193 - 1196   2003年02月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

Effect of pressure on the ferromagnetic cerium compound CeCu9Sn4

Y Ishii, N Mori, M Hedo, Y Uwatoko

ACTA PHYSICA POLONICA B ( ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS )  34 ( 2 ) 1249 - 1252   2003年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Electrical resistivity measurements under hydrostatic pressure up to 2.2 GPa was carried out for a ferromagnetic ternary cerium compound CeCu9Sn4. The ferromagnetic transition temperature increases with increasing pressure up to 0.8 GPa and then decreases with increasing pressure above 1 GPa. Origins of this pressure dependence may be the competition between magnetic interaction in the c-plane and along the c-direction.

Pressure effect on antiferromagnetic ordering in UPb₃

Haga, Y; Yamamoto, E; Onuki, Y; Nakashima, M; Aoki, D; Onuki, Y; Hedo, M; Uwatoko, Y

ACTA PHYSICA POLONICA B   34 ( 2 ) 1239 - 1242   2003年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Pressure effect on antiferromagnetic ordering in UPb3

Y. Haga, E. Yamamoto, Y. Onuki, M. Nakashima, D. Aoki, M. Hedo, Y. Uwatoko

Acta Phys. Pol. B   34 ( 2 ) 1239   2003年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Effect of pressure on the ferromagnetic cerium compound CeCu₉Sn₄

Ishii, Y; Mori, N; Hedo, M; Uwatoko, Y

ACTA PHYSICA POLONICA B   34 ( 2 ) 1249 - 1252   2003年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Effect of pressure on the superconductor Cd₂Re₂O₇

Abliz, M; Hedo, M; Uwatoko, Y; Matsumoto, T; Hanawa, M; Hiroi, Z

ACTA PHYSICA POLONICA B   34 ( 2 ) 489 - 492   2003年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Charge density wave, superconductivity, and non-metallic behaviour under high pressure in ZrTe3

Igarashi K, Yasuzuka S, Inagaki K, Tanda S, Okajima Y, Hedo M, Uwatoko Y, Yamaya K

JOURNAL DE PHYSIQUE IV   12 ( PR9 ) 97 - 98   2002年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Charge density wave, superconductivity, and non-metallic behaviour under high pressure in ZrTe<inf>3</inf>

K. Igarashi, S. Yasuzuka, K. Inagaki, S. Tanda, Y. Okajima, M. Hedo, Y. Uwatoko, K. Yamaya

Journal De Physique. IV : JP   12 ( 9 )   2002年11月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

　概要を見る

The charge-density-wave (CDW) order of low-dimensional inorganic conductor ZrTe3 is found to increase with increasing pressure, while the superconductivity with filamentary nature is significantly suppressed. It was evidenced in resistivity measurements under pressure up to 0.8 Gpa. The present results suggest that competition between the superconductivity and the CDW is not simply explained by a nesting effect of the Fermi surface, but other origin is needed. Non-metallic behaviour is also found below 4K under high pressures above 0.6 Gpa. The relationship between the non-metallic state and the pressure-enhanced CDW is expected, although yet inexplicable.

Elucidation of the stable vortex state across the peak effect region in CeRu₂

Tulapurkar, AA; Heidarian, D; Sarkar, S; Ramakrishnan, S; Grover, AK; Yamamoto, E; Haga, Y; Hedo, M; Inada, Y; Onuki, Y

PHYSICA C ( ELSEVIER SCIENCE BV )  355 ( 1-2 ) 59 - 64   2001年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We present magnetization data on a weakly pinned single crystal of CeRu2 showing the existence of a stable state of the vortex matter in the peak effect (PE) region. The stable state is achieved by cycling the magnetic field by a small amplitude. It is characterized by a unique value of the critical current density, independent of the magnetic history of the sample. The results support a recent phenomenological model proposed by Ravikumar et al. [Phys. Rev. B 61 (2000) R6479] which postulates a specific recipe to incorporate the history dependence of the current density. Our data also shows the occurrence of a first order phase transition from an ordered vortex phase to a disordered phase across the PE. (C) 2001 Elsevier Science B.V. All rights reserved.

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Coulomb correlations and two-channel conduction in CuIr2S4 and CuIr2Se4 compounds

Yagasaki K, Nakama T, Hedo M, Burkov AT, Matsumoto N, Nagata S

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   226   244 - 245   2001年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Anomalous resistivity and thermopower of the spinel-type compounds CuIr2S4 and CuIr2Se4

Burkov AT, Nakama T, Hedo M, Shintani K, Yagasaki K, Matsumoto N, Nagata S

PHYSICAL REVIEW B   61 ( 15 ) 10049 - 10056   2000年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Anisotropic magnetoresistance in UBe13

Haga Y, Yamamoto E, Honma T, Nakamura A, Hedo M, Araki S, Ohkuni H, Onuki Y

PHYSICA B-CONDENSED MATTER   259-61   627 - 628   1999年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

de Haas-van Alphen oscillation in the superconducting mixed states of CeRu2 and URu2Si2

Onuki Y, Inada Y, Hedo M, Ohkuni H, Sakurai K, Tokiwa Y, Yamamoto E, Haga Y, Honma T, Takahashi S

PHYSICA B-CONDENSED MATTER   259-61   1060 - 1065   1999年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

de Haas-van Alphen effect of the heavy-fermion superconductor URu2Si2

Inada Y, Ohkuni H, Hedo M, Tokiwa Y, Sakurai K, Haga Y, Yamamoto E, Honma T, Onuki Y

PHYSICA B-CONDENSED MATTER   259-61   642 - 643   1999年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Characterization and flux flow experiments in CeRu2

Hedo M, Kobayashi Y, Inada Y, Yamamoto E, Haga Y, Suzuki J, Metoki N, Onuki Y, Sugawara H, Sato H, Tenya K, Tayama T, Amitsuka H, Sakakibara T

PHYSICA B-CONDENSED MATTER   259-61   688 - 689   1999年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Effect of pressure on the flux flow resistance of CeRu2

Kagayama T, Kitakoga R, Oomi G, Honda K, Hedo M, Onuki Y

PHYSICA B-CONDENSED MATTER   259-61   694 - 695   1999年01月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

Fermi surface of UB₂ studied by the de Haas-van Alphen oscillation

Yamamoto, E; Honma, T; Haga, Y; Inada, Y; Aoki, D; Hedo, M; Yoshida, Y; Yamagami, H; Onuki, Y

PHYSICA B-CONDENSED MATTER   259-61   1085 - 1086   1999年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We observed the de Haas-van Alphen (dHvA) oscillation of UB2 with a hexagonal structure. All of the detected dHvA branches, which are about seven in number, are detected in the limited angle regions. The cyclotron masses are moderately heavy, ranging from 1.2 to 7.7 m0. These features of the Fermi surface are well explained by the 5f-itinerant band theory. © 1999 Elsevier Science B.V. All rights reserved.

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Field-history-dependent peak effect in the superconducting mixed state of CeRu₂

Tenya, K; Yasunami, S; Tayama, T; Amitsuka, H; Sakakibara, T; Hedo, M; Inada, Y; Haga, Y; Yamamoto, E; Onuki, Y

PHYSICA B-CONDENSED MATTER ( ELSEVIER SCIENCE BV )  259-61   692 - 693   1999年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Detailed magnetization measurements of CeRu2 single crystals with different purity are performed in order to clarify whether their peak effects are due to the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) transition. The onset field of the peak shifts to lower held side as the sample becomes impure. Regardless of the purity the Ginzburg-Landau parameter kappa(2) continues to increase on cooling from T-c, indicating little paramagnetic suppression of the superconductivity. These results disagree with the scenario of the FFLO transition. (C) 1999 Elsevier Science B.V, All rights reserved.

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Anisotropic magnetoresistance in UBe<inf>13</inf>

Y. Haga, E. Yamamoto, T. Honma, A. Nakamura, M. Hedo, S. Araki, H. Ohkuni, Y. Onuki

Physica B: Condensed Matter   259-261   627 - 628   1999年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Angular dependence of the transverse magnetoresistance of a heavy-fermion superconductor UBe13 (Tc = 0.9 K) was measured on a single crystal grown by the Al-flux method. The resistivity decreases with increasing the magnetic field at low temperatures, indicating that a magnetic scattering is suppressed by the magnetic field. We observed a remarkable angular dependence in magnetoresistance at 0.45 K under a constant field of 13 T, showing a minimum at the [1 1 0] direction. This anisotropy of magnetoresistance is observed below 4 K. Since the large resistivity (200 μΩ cm) of this compound at low temperatures is attributed to the magnetic scattering by uranium ions, the present anisotropy in the magnetic scattering at low temperatures would give important information about the ground state of 5f electrons. © 1999 Elsevier Science B.V. All rights reserved.

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Peak effect in CeRu2: Role of crystalline defects

Hedo M, Kobayashi Y, Inada Y, Yamamoto E, Haga Y, Suzuki J, Metoki N, Onuki Y, Sugawara H, Sato H, Tenya K, Tayama T, Amitsuka H, Sakakibara T

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   67 ( 10 ) 3561 - 3569   1998年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Electrodynamics of the superconducting state in CeRu₂

Matsui, H; Yasuda, T; Hedo, M; Settai, R; Onuki, Y; Yamamoto, E; Haga, Y; Toyota, N

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN ( PHYSICAL SOC JAPAN )  67 ( 10 ) 3580 - 3584   1998年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We have studied the complex conductivity in superconducting and normal metallic slates of CeRu2 by the surface impedance measurements at millimeter-wave frequency of 45.4 GHz. The temperature dependence of the complex conductivity below T-c = 6.2 K exhibits the characteristic behaviors as seen in a conventional superconductor. The coherence peak observed in the real part al provides a strong evidence for a conventional s-wave superconductivity as well as the previous NQR measurements. The temperature dependence of the penetration depth evaluated from the surface reactance at low temperatures has revealed the ratio of 2 Delta(0)/k(B)T(c) = 4.4. The strong-coupling theories suggest the electron-phonon coupling strength with lambda(cp) &lt; 2. These results indicate that CeRu2 is an intermediate strong-coupling superconductor in a clean limit.

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De Haas-van Alphen effect and energy band structure in UB2

Yamamoto E, Haga Y, Honma T, Inada Y, Aoki D, Hedo M, Yoshida Y, Yamagami H, Onuki Y

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   67 ( 9 ) 3171 - 3175   1998年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Anomalous peak effect in CeRu2 and 2H-NbSe2: Fracturing of a flux line lattice

Banerjee SS, Patil NG, Saha S, Ramakrishnan S, Grover AK, Bhattacharya S, Ravikumar G, Mishra PK, Rao TVC, Sahni VC, Higgins MJ, Yamamoto E, Haga Y, Hedo M, Inada Y, Onuki Y

PHYSICAL REVIEW B   58 ( 2 ) 995 - 999   1998年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

A novel technique to measure magnetisation hysteresis curves in the peak-effect regime of superconductors

Ravikumar G, Rao TVR, Mishra PK, Sahni VC, Banerjee SS, Grover AK, Ramakrishnan S, Bhattacharya S, Higgins MJ, Yamamoto E, Haga Y, Hedo M, Inada Y, Onuki Y

PHYSICA C   298 ( 1-2 ) 122 - 132   1998年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Acoustic de Haas van Alphen effect of CeRu2

Suzuki T, Okuda N, Goshima H, Fujita T, Hedo M, Inada Y, Onuki Y, Yamamoto E, Haga Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   177   415 - 416   1998年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

De Haas-van Alphen effect in RFe4P12 (R = La and Nd)

Sugawara H, Abe Y, Aoki Y, Sato H, Hedo M, Settai R, Onuki Y

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   177   359 - 360   1998年01月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Anomalous field dependence of magnetic penetration depth in the vortex state of CeRu2 probed by muon spin rotation

Yamashita A, Ishii K, Yokoo T, Akimitsu J, Hedo M, Inada Y, Onuki Y, Yamamoto E, Haga Y, Kadono R

PHYSICAL REVIEW LETTERS   79 ( 19 ) 3771 - 3774   1997年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

AC and DC magnetisation studies of peak effect in a clean crystal of CeRu2

Patil NG, Banerjee SS, Saha S, Ghosh K, Ramakrishnan S, Bhattacharya S, Grover AK, Rao TVC, Ravikumar G, Mishra PK, Sahni VC, Yamamoto E, Haga Y, Hedo M, Inada Y, Onuki Y

PHYSICA C   282   2043 - 2044   1997年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Elastic properties of CeRu2

Wolf, B; Hinkel, C; Holtmeier, S; Wichert, D; Kouroudis, I; Bruls, G; Luthi, B; Hedo, M; Inada, Y; Yamamoto, E; Haga, Y; Onuki, Y

JOURNAL OF LOW TEMPERATURE PHYSICS ( PLENUM PUBL CORP )  107 ( 3-4 ) 421 - 441   1997年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

We present data of the elastic properties of the Laves phase compound CeRu2 in the normal and superconducting state obtained from ultrasound measurements. In the temperature range between the superconducting transition temperature of 6.1 K and 300 K we used a deformation potential coupling approach to describe the temperature dependence of the elastic constants. The elastic anomalies in the superconducting state are characterised with the model of thermally assisted flux flow (TAFF). This enables us to construct a detailed superconducting B-T phase diagram including the vortex dynamics and interpret the peak effect region. Especially the ultrasonic measurements exhibit clearly the connectin between the normal state and the superconducting properties. They slow that structural fluctuations have strong effects on the superconductivity and on the vortex dynamics.

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Effect of field inhomogeneity on the magnetisation measurements in the peak effect region of CeRu2 superconductor

Ravikumar G, Rao TVC, Mishra PK, Sahni VC, Saha S, Banerjee SS, Patil NG, Grover AK, Ramakrishnan S, Bhattacharya S, Yamamoto E, Haga Y, Hedo M, Inada Y, Onuki Y

PHYSICA C   276 ( 1-2 ) 9 - 17   1997年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

dHvA oscillation in the superconducting mixed state of CeRu2

Inada Y, Hedo M, Ishida T, Yamamoto E, Haga Y, Onuki Y

PHYSICA B   230   387 - 390   1997年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Giant lattice softening in the normal state of CeRu2

Suzuki, T; Goshima, H; Sakita, S; Fujita, T; Hedo, M; Inada, Y; Yamamoto, E; Haga, Y; Onuki, Y

PHYSICA B ( ELSEVIER SCIENCE BV )  230   176 - 178   1997年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Elastic moduli of high-quality single-crystalline CeRu2 have been measured between 2 and 300 K by an ultrasonic technique. Both shear moduli of (C-11 - C-12)/2 and C-44 show a giant softening without structural transition. In contrast to the shear moduli, the bulk modulus C-B indicates a normal temperature dependence without the anomalous softening. These results reveal that there exists a remarkable structural fluctuation corresponding to shearing strain in the normal state of CeRu2. The analysis taking account of the deformation potential coupling between the strain and an electronic energy band demonstrates that degenerate and peaked density of states is responsible for the softening.

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Anomalous pinning in superconductors with strong Pauli paramagnetism

Onuki Y, Hedo M, Inada Y, Settai R, Sugawara H, Aoki Y, Sato H, Deppe M, Gegenwart P, Geibel C, Lang M, Luhmann T, Modler R, Weiden M, Steglich F, Paulsen C, Tholence JL, Sato N, Komatsubara T, Tachiki M, Takahashi S

PHYSICA B-CONDENSED MATTER   223-24 ( 1-4 ) 28 - 32   1996年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

Anomalous pinning in superconductors with strong Pauli paramagnetism

Y Onuki, M Hedo, Y Inada, R Settai, H Sugawara, Y Aoki, H Sato, M Deppe, P Gegenwart, C Geibel, M Lang, T Luhmann, R Modler, M Weiden, F Steglich, C Paulsen, JL Tholence, N Sato, T Komatsubara, M Tachiki, S Takahashi

PHYSICA B-CONDENSED MATTER ( ELSEVIER SCIENCE BV )  223-24 ( 1-4 ) 28 - 32   1996年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The results of the magnetization, magnetostriction and AC-susceptibility experiments are presented for both the antiferromagnetic heavy-Fermion superconductor UPd(2)Al(3) and the valence fluctuation compound CeRu(2). For (H &gt; 10 kOe). These results are discussed on the basis of a generalized Fulde-Ferrell-Larkin-Ovchinnikov superconducting state.

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de Haas-van Alphen oscillation in both normal and superconducting mixed states of CeRu2

Hedo M, Inada Y, Ishida T, Yamamoto E, Haga Y, Onuki Y, Higuchi M, Hasegawa A

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   64 ( 12 ) 4535 - 4539   1995年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

FIELD-INDUCED SUPERCONDUCTIVITY OF CERU(2)

YAGASAKI, K; HEDO, M; NAKAMA, T; SAKAI, E; NIKI, H

PHYSICA B-CONDENSED MATTER ( Physica B: Physics of Condensed Matter )  194 ( PART 2 ) 2089 - 2090   1994年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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