研究者詳細 - 摂待　力生

MISC - 摂待　力生

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A change of the Fermi surface in UGe2 across the critical pressure

R. Settai, M. Nakashima, S. Araki, Y. Haga, T. C. Kobayashi, N. Tateiwa, H. Yamagami, Y. Onuki

Journal of Physics Condensed Matter 14 ( 1 ) L29 - L36 2002年1月

記述言語：英語掲載種別：速報，短報，研究ノート等（学術雑誌）

We carried out the de Haas-van Alphen (dHvA) experiment under pressure for a ferromagnet UGe2. The dHvA frequency of a main dHvA branch named α, that corresponds to a majority up-spin band 40-hole Fermi surface, decreases monotonously with increasing pressure, but in the pressure range from P*c (≃1.2 GPa) to pc (≃1.5 GPa) the dHvA signal disappears completely, where pc and p*c correspond to critical pressures for a Curie temperature TC and the second phase transition temperature T* (&lt
TC), respectively. For p &gt
pc we observed new dHvA branches with large cyclotron masses of 19-64m0, which correspond to main Fermi surfaces in the paramagnetic state.

DOI： 10.1088/0953-8984/14/1/104

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115In-NQR evidence for unconventional superconductivity in CeIn3 under pressure

Physical Review B 66, 054521/, 2002年

Fermi surface, magnetic and superconducting properties of LaRhIn5 and CeTIn5 (T: Co and Rh)

Journal of the Physical Society of Japan Suppliment, 71, 276 71, 276 2002年

115In-NQR evidence for unconventional superconductivity in CeIn3 under pressure

Physical Review B 66, 054521 2002年

5f-itinerant Antiferromagnetism and Fermi surface property in UGa3, UFeGa5, UNiGa5 and UPtGa5

Yoshichika Ōnuki, Yoshihumi Tokiwa, Shugo Ikeda, Dai Aoki, Yoshihiko Inada, Rikio Settai, Takahiro Maehira, Etsuji Yamamoto, Yoshinori Haga

Journal of Nuclear Science and Technology 39 114 - 117 2002年

記述言語：英語

We measured the magnetic susceptibilityand de Haas-van Alphen (dHvA) oscillation in UGa3 and UTGa5 (T: Fe, Ni andPt). The susceptibility in UGa3 and UTGa5 is almost temperature-independent. It does not follow the Curie-Weiss law in the paramagnetic region, being dominated by a Pauli-like contribution, although UGa3 and UTGa5 (T: Ni and Pt) order antiferro-magnetically. The electronic state in UTGa5 is unique, indicating quasi-two dimensionality. Nearly cylindrical Fermi surfaces are formed by itinerant-5f electrons. © 2014 Taylor and Francis Group, LLC.

DOI： 10.1080/00223131.2002.10875421

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Thermal properties of a ferromagnetic superconductor UGe2

Naoyuki Tateiwa, Tatsuo C. Kobayashi, Kichi Amaya, Yoshinori Haga, Rikio Settai, Yoshichika Onuki

Journal of Nuclear Science and Technology 39 195 - 198 2002年

記述言語：英語

Thermal properties of a ferromagnetic superconductor UGe2 were investigated by the heat capacity measurements. The bulk nature of the superconductivity was confimied by the observation of a peak in the heat capacity at the superconducting transition temperature T SC, From the pressure dependence of the linear heat capacity coefficient γ, it is suggested that the low energy magnetic excitation near the critical point Pc*, where T* becomes OK, might play an important role on the superconductivity. The pressure dependence of the superconducting peak and the temperature dependence of CIT above T SC suggest that the order parameter of the superconducting state might be different between the phases below and above PC *. © 2002 Atomic Energy Society of Japan. All rights reserved.

DOI： 10.1080/00223131.2002.10875442

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Fermi surface instability in CeRh2Si2 under pressure

S Araki, R Settai, TC Kobayashi, H Harima, Y Onuki

PHYSICAL REVIEW B 64 ( 22 ) 224417 2001年12月

記述言語：英語出版者・発行元：AMER PHYSICAL SOC

That the 4f electrons in the rare-earth antiferromagnetic compound CeRh2Si2 should be considered as localized electrons at cerium sites has been confirmed by comparing a de Haas-van Alphen experiment to the result of energy band calculations for LaRh2Si2. When pressure p is applied to the compound, the Neel temperature T-N1 = 36 K decreases and finally becomes zero at p(c)similar or equal to1.0-1.1 GPa. The topology of the Fermi surface is found to be almost unchanged up to 1.0 GPa, but the cyclotron effective mass increases with increasing pressure. Above 1.1 GPa, the topology of the Fermi surface changes abruptly. A new Fermi surface is explained by the 4f-itinerant-band model. The corresponding cyclotron mass is large, being about 22m(o).

DOI： 10.1103/PhysRevB.64.224417

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Fermi surface and magnetic properties of the antiferromagnet UIn3

Y Tokiwa, D Aoki, Y Haga, E Yamamoto, S Ikeda, R Settai, A Nakamura, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 70 ( 11 ) 3326 - 3330 2001年11月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We succeeded in, growing a high-quality single crystal Of UIn3 by the self-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization, specific heat and de Haas-van Alphen (dHvA) oscillation. We confirmed the Neel temperature at T-N = 88 K from both the electrical resistivity and magnetic susceptibility measurements. We observed many dHvA branches. The Fermi surfaces axe found to consist of closed Fermi surfaces and a multiply-connected Fermi surface. The cyclotron mass is relatively large, ranging from 9.8 to 33m(0).

DOI： 10.1143/JPSJ.70.3326

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UGe2の強磁性と超伝導の共存

小林達生, 芳賀芳範, 立岩尚之, 山上浩志, 摂待力生, 大貫惇睦

固体物理 36 ( 11 ) 43(803) - 48(808) 2001年11月

Magnetic properties of a pressure-induced superconductor UGe2

N Tateiwa, K Hanazono, TC Kobayashi, K Amaya, T Inoue, K Kindo, Y Koike, N Metoki, Y Haga, R Settai, Y Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 70 ( 10 ) 2876 - 2879 2001年10月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We performed DC-magnetization and neutron scattering experiments under pressure P for a pressure-induced superconductor UGe2. We found that the magnetic moment is enhanced at a characteristic temperature T* in the ferromagnetic state, where T* is smaller than a Curie temperature T-C. This enhancement becomes remarkable in the vicinity of P-C* = 1.20 GPa, where T* becomes 0 K and the superconducting transition temperature T-SC shows a maximum. The characteristic temperature T*, which decreases with increasing pressure, also depends on the magnetic field.

DOI： 10.1143/JPSJ.70.2876

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d,f,p電子系重い電子系 (<相関電子系の物質設計>特集号)

大貫惇睦, 摂待力生

固体物理 36 ( 10 ) 723 - 731 2001年10月

18pYD-3 UNiGa_5の圧力下物性

中島美帆, 中脇宙一, 常盤欣文, 芳賀芳範, 加賀山朋子, 上床美也, 摂待力生, 大貫惇睦

日本物理学会講演概要集 56 ( 2 ) 431 - 431 2001年9月

19aPS-46 CeCoIn_5の量子臨界点での物性

宍戸寛明, 中島美帆, 池田修悟, Thamizhavel Arumugam, 稲田佳彦, 摂待力生, 芳賀芳範, 大貫惇睦

日本物理学会講演概要集 56 ( 2 ) 479 - 479 2001年9月

19aPS-54 UIrの物性

山本悦嗣, 芳賀芳範, 宍戸寛明, 中脇宙一, 稲田佳彦, 摂待力生, 菅原仁, 佐藤英行, 大貫惇睦

日本物理学会講演概要集 56 ( 2 ) 481 - 481 2001年9月

高圧下におけるUIrの磁性 : 非磁性転移

藤原旅人, 小林達生, 花園勝巳, 天谷喜一, 山本悦嗣, 摂待力生, 大貫惇生, Onuki Yoshichika

日本物理学会講演概要集 56 ( 2 ) 432 - 432 2001年9月

18pYD-13 圧力誘起超伝導体UGe_2の加圧下のdHvA効果

摂待力生, 中島美帆, 荒木新吾, 宍戸寛明, 中脇宙一, 芳賀芳範, 山本悦嗣, 大貫惇睦, 小林達生

日本物理学会講演概要集 56 ( 2 ) 433 - 433 2001年9月

18pYD-1 UCoGa_5及びUCoGa_5のドハース・ファンアルフェン効果

池田修吾, 常盤欣文, 大久保智幸, 宍戸寛明, 稲田佳彦, 摂待力生, 芳賀芳範, 大貫惇睦

日本物理学会講演概要集 56 ( 2 ) 430 - 430 2001年9月

18aYD-4 CeRh_2Si_2の圧力下でのdHvA効果(III)

荒木新吾, 中島美帆, 中脇宙一, 摂待力生, 播磨尚朝, 大貫惇睦

日本物理学会講演概要集 56 ( 2 ) 413 - 413 2001年9月

18pYD-14 圧力誘起超伝導物質UGe_2の高圧下比熱・磁化測定

立岩尚之, 小林達至, 天谷喜一, 井上鉄太郎, 金道浩一, 芳賀芳範, 摂待力生, 大貫惇睦, 上床美也

日本物理学会講演概要集 56 ( 2 ) 433 - 433 2001年9月

20aYD-9 CeRhIn_5の圧力下^<115>In-NQRによる研究II

川崎慎司, 水戸毅, Thessiue C., 川崎祐, 鄭国慶, 石田憲二, 北岡良雄, 青木大, 荒木新吾, 芳賀芳範, 摂待力生, 大貫惇睦

日本物理学会講演概要集 56 ( 2 ) 507 - 507 2001年9月

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