論文 - 辺土　正人

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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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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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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