研究者詳細 - 摂待　力生

MISC - 摂待　力生

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24pWR-14 ^<115>In-NQRによる重い電子系化合物Ce_2RhIn_8における磁性と超伝導(24pWR Ce化合物の超伝導,領域8(強相関係:高温超伝導,強相関f電子系など))

谷口庄一, 八島光晴, 椋田秀和, 北岡良雄, 宍戸寛明, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 611 - 611 2008年2月

24pWR-1 空間反転対称性を持たないRPt_3SiとRIrSi_3(R:La,Ce)における超伝導の研究(24pWR Ce化合物の超伝導,領域8(強相関係:高温超伝導,強相関f電子系など))

竹内徹也, 辻野真彦, 宮内裕一郎, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 608 - 608 2008年2月

23pPSB-23 正方晶RCu_2Si_2(R:希土類)の強磁場磁化過程(23pPSB ポスターセッション(f電子系等II),領域8(強相関係:高温超伝導,強相関f電子系など))

太田有基, 宮内裕一朗, 杉山清寛, 竹内徹也, DUNG Nguyen Duc, 松田達磨, 芳賀芳範, 萩原政幸, 金道浩一, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 551 - 551 2008年2月

23pPSA-24 Ce_2Ir_3Ge_5の高圧下電気抵抗(23pPSA ポスターセッション(f電子系等I),領域8(強相関係:高温超伝導,強相関f電子系など))

米山琢也, 相澤勇也, 有松孝真, 村中大志, Thamizhavel Arumugam, 中島美帆, 天児寧, 本多史憲, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 540 - 540 2008年2月

23pPSA-45 ピエゾ素子を用いたCe系超伝導体の点接合分光II(23pPSA ポスターセッション(f電子系等I),領域8(強相関係:高温超伝導,強相関f電子系など))

小貫龍一, 住山昭彦, 小田祺景, 宍戸寛明, 安田敬, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 546 - 546 2008年2月

24aYB-3 高圧下におけるCePd_5Al_2単結晶の量子臨界点の探索(24aYB Ce化合物他,領域8(強相関係:高温超伝導,強相関f電子系など))

本多史憲, メアッソンマリオド, 中野泰典, 摂待力生, 清水克哉, 山本悦嗣, 芳賀芳範, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 568 - 568 2008年2月

24aYB-2 CePd_5Al_2の単結晶育成と物性(24aYB Ce化合物他,領域8(強相関係:高温超伝導,強相関f電子系など))

中野泰典, 吉谷尚久, 本多史憲, 芳賀芳範, 竹内徹也, 杉山清寛, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 568 - 568 2008年2月

24pWR-8 CeIrIn_5の超伝導対称性(24pWR Ce化合物の超伝導,領域8(強相関係:高温超伝導,強相関f電子系など))

笠原裕一, 岩澤卓也, 清水悠晴, 宍戸寛明, 柴内孝禎, 松田祐司, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 1 ) 610 - 610 2008年2月

23pPSB-22 Magnetic Properties and Crystalline Electric Field Effect in RCu_2Si_2 (R: Rare Earth)

Dung N.D., Matsuda T.D., Haga Y., Ikeda S., Yamamoto E., Takeda Y., Ota Y., Endo T., Takeuchi T., Sugiyama K., Settai R., Harima H., Hagiwara M., Kindo K., Onuki Y

日本物理学会講演概要集 63 ( 1 ) 551 - 551 2008年2月

Single crystal growth and the fermi surface property in LuCoGa5

Tatsuma D. Matsuda, Yoshinori Haga, Hironori Sakai, Dai Aoki, Shugo Ikeda, Etsuji Yamamoto, Hiroaki Shishido, Rikio Settai, Hisatomo Harima, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 ( 2 ) 2008年2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 LuCoGa5 with the HoCoGa5-type tetragonal crystal structure by the Ga self-flux method. The lattice parameters, fractional coordinates, and thermal parameters were determined from single-crystal x-ray diffraction measurements. We also measured the electrical resistivity, specific heat, and the de Haas-van Alphen (dHvA) effect. The Fermi surface mainly consists of two nearly cylindrical Fermi surfaces, which are well explained by the results of full-potential linearized augmented plane wave (FLAPW) energy band calculations.

DOI： 10.1143/JPSJ.77.024704

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Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An In-115-NQR study under pressure

S. Kawasaki, M. Yashima, Y. Kitaoka, K. Takeda, K. Shimizu, Y. Oishi, M. Takata, T. C. Kobayashi, H. Harima, S. Araki, H. Shishido, R. Settai, Y. Onuki

PHYSICAL REVIEW B 77 ( 6 ) 2008年2月

記述言語：英語出版者・発行元：AMER PHYSICAL SOC

We report on pressure-induced unconventional superconductivity (SC) in the heavy-fermion (HF) antiferromagnet CeIn3 by means of nuclear-quadrupole-resonance (NQR) studies conducted under a high pressure. The temperature (T) and pressure (P) dependences of the In-NQR spectra have revealed a first-order quantum-phase transition (QPT) from antiferromagnetism (AFM) to paramagnetism (PM) at a critical pressure P-c=2.46 GPa at which AFM disappears with a minimum value of T-N(P-c)=1.2 K. High-energy x-ray scattering measurements under P show a progressive decrease in the lattice density without any change in the crystal structure, whereas an increase in the NQR frequency (nu(Q)) indicates an increase in the hybridization between 4f electrons and conduction electrons, which stabilizes the HF-PM state. This competition between the AFM phase where T-N is reduced and the formation of the HF-PM phase triggers the first-order QPT at P-c=2.46 GPa. Despite the lack of an AFM quantum critical point in the P-T phase diagram, we highlight the fact that unconventional SC occurs in both phases of AFM and PM. The measurements of the nuclear spin-lattice relaxation rate 1/T-1 in the AFM phase have provided evidence for the uniformly coexisting AFM+SC phase. Remarkably, the significant increase in 1/T-1 upon cooling in the AFM phase has revealed the development of low-lying magnetic excitations down to T-c in the AFM phase; it is indeed relevant to the onset of the uniformly coexisting AFM+SC phase. In the HF-PM phase where AFM fluctuations are not developed, 1/T-1 decreases without the coherence peak just below T-c, followed by a power-law-like T dependence that indicates an unconventional SC with a line-node gap. Remarkably, T-c has a peak around P-c in the HF-PM phase as well as in the AFM phase. In other words, an SC dome exists with a maximum value of T-c=230 mK around P-c, indicating that the origin of the pressure-induced HF SC in CeIn3 is not relevant to AFM spin fluctuations but to the emergence of the first-order QPT in CeIn3. These phenomena observed in CeIn3 should be understood in terms of the first-order QPT because these new phases of matter are induced by applying P. When the AFM critical temperature is suppressed at the termination point of the first-order QPT, P-c=2.46 GPa, the diverging AFM spin-density fluctuations emerge at the critical point from AFM to PM. The results with CeIn3 leading to a new type of quantum criticality deserve further theoretical investigations.

DOI： 10.1103/PhysRevB.77.064508

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23pPSA-37 角度分解光電子分光によるCeIrSi_3、LaIrSi_3の電子構造の研究(23pPSA ポスターセッション(f電子系等I),領域8(強相関係:高温超伝導,強相関f電子系など))

利光孝文, 宮内裕一朗, 奥田悠介, 摂待力生, 大貫惇睦, 大河内拓雄, 保井晃, 小林正起, 竹田幸治, 岡根哲夫, 斎藤祐児, 藤森淳, 山上浩志

日本物理学会講演概要集 63 ( 0 ) 544 - 544 2008年

21aPS-70 Ce 3d→4f共鳴角度分解光電子分光によるCeNiの電子構造(21aPS 領域8ポスターセッション(f電子系等および低温),領域8(強相関系:高温超伝導,強相関f電子系など))

大河内拓雄, 大貫惇睦, 藤森伸一, 岡根哲夫, 竹田幸治, 保井晃, 斉藤祐児, 山上浩志, 藤森淳, 摂待力生

日本物理学会講演概要集 63 ( 0 ) 2008年

Unconventional superconductivity and antiferromagnetic quantum phase transition in CeRhIn5: 115In-NQR study under pressure

Physica B Vol. 403 (Issues 5-9, April)(2008), pp. 914-916. 2008年

de Haas-van Alphen study of the filled skutterudite compounds.

H. Sugawara, Y. Iwahashi, K. Magishi, T. Saito, K. Koyama, H. Harima, D. Kikuchi, H. Sato, T. Endo, R. Settai, Y. Onuki

Journal of the Physical Society of Japan 77 ( Suppl. A ) 108-113. 2008年

RPd5Al2(R=Ce,Pr,Y)の単結晶育成と電子状態

中野泰典, 吉谷尚久, 本多史憲, 芳賀芳範, 山本悦嗣, 山上浩志, 竹内徹也, 杉山清寛, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 2 ) 2008年

空間反転対称性のない重い電子系超伝導体CeIrSi3の角度分解光電子分光

藤森伸一, 藤森伸一, MO S.K., MO S.K., 田中清尚, 田中清尚, HUSSAIN Z., SHEN Z.X., 藤森淳, 藤森淳, 山上浩志, 山上浩志, 摂待力生, 大貫惇睦

日本物理学会講演概要集 63 ( 2 ) 2008年

空間反転対称性のない重い電子系超伝導体CeIrSi_3及びCePt_3SiにおけるNMR(不均一超伝導超流動状態と量子物理,研究会報告)

椋田秀和, 西出早治大, 小原崇, 藤井拓也, 原田淳之, 八島光晴, 北岡良雄, 辻野真彦, 奥田悠介, 摂待力生, 大貫惇睦

物性研究 91 ( 3 ) 233 - 233 2008年

高圧下における重い電子系超伝導体NpPd5Al2の超伝導の研究

本多史憲, GARDE C.S, 遠藤豊明, 摂待力生, 大貫惇睦, 青木大, 本間佳哉, 芳賀芳範, 松田達麿, 立岩尚之, 池田修悟, 酒井宏典, 塩川佳伸, 山本悦嗣, 中村彰夫

高圧討論会講演要旨集 48th 58 2007年11月

AC/DC susceptibility of the heavy-fermion superconductor CePt3Si under pressure

Yoshihiro Aoki, Akihiko Sumiyama, Gaku Motoyama, Yasukage Oda, Takashi Yasuda, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 76 ( 11 ) 2007年11月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We have investigated the pressure dependence of ac and dc susceptibilities (chi(ac) and chi(dc)) of the heavy-fermion superconductor CePt3Si (T-c = 0.75 K) that coexists with antiferromagnetism(T-N = 2.2 K). As hydrostatic pressure is increased, T-c first decreases rapidly, then rather slowly near the critical pressure P-c = 0.6 GPa and shows a stronger decrease again at higher pressures, where P-c is the pressure at which T-N becomes zero. A transition width and a difference in the two transition temperatures defined in the form of structures in the out-of-phase component Of chi(ac) also become small near P-c, indicating that a double transition observed in CePt3Si is caused by some inhomogeneous property in the sample that leads to a spatial variation of local pressure. A sudden increase in the Meissner fraction above P-c suggests the influence of antiferromagnetism on superconductivity.

DOI： 10.1143/JPSJ.76.114708

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