研究者詳細 - 摂待　力生

MISC - 摂待　力生

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23aWG-8 YbIr_2Zn_<20>の量子臨界点の研究(23aWG Yb化合物,領域8(強相関系:高温超伝導,強相関f電子系など))

安井慎一, 吉内伸吾, 本多史憲, 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 65 ( 2 ) 450 - 450 2010年8月

23pPSB-27 重い電子系超伝導体CeIr(In_<1-x>Cd_x)_5の^<115>In-NQRによる研究(23pPSB 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

植松克吉, 谷口庄一, 田上尚基, 畦森達也, 八島光晴, 椋田秀和, 北岡良雄, 太田有基, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 533 - 533 2010年8月

23pPSA-31 PrIr_2Zn_<20>とYbIr_2Zn_<20>のドハース・ファンアルフェン効果とフェルミ面(23pPSA 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

阪口隼也, 田賀悠記, 松下昌輝, 大家政洋, 吉内伸吾, 本田史憲, 竹内徹也, 山本悦嗣, 芳賀芳範, 田中斗志貴, 久保康則, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 518 - 518 2010年8月

23aWG-7 YbIr_2Zn_<20>の極低温磁化(23aWG Yb化合物,領域8(強相関系:高温超伝導,強相関f電子系など))

志村恭通, 榊原俊郎, 吉内伸吾, 本多史憲, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 450 - 450 2010年8月

23aWG-9 YbCo_2Zn_<20>のメタ磁性(23aWG Yb化合物,領域8(強相関系:高温超伝導,強相関f電子系など))

大家政洋, 吉内伸吾, 松下昌輝, 竹内徹也, 本多史憲, 田中斗志貴, 久保康則, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 450 - 450 2010年8月

23pPSB-37 重い電子系化合物CePtSi_2のNMRによる研究(常圧)(23pPSB 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

畦森達也, 八島光晴, 椋田秀和, 北岡良雄, 西村尚人, 本多史憲, 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 65 ( 2 ) 536 - 536 2010年8月

23pPSA-27 超高圧下におけるYbIr_2Zn_<20>の磁性と伝導(23pPSA 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

本多史憲, 安井慎一, 吉内伸吾, 竹内徹也, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 517 - 517 2010年8月

23pPSA-32 RIr_2Zn_<20>(R:希土類元素)の単結晶育成と電子状態の研究(23pPSA 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

田賀悠記, 太田尚志, 西村尚人, 岩川健, 吉内伸吾, 安井慎一, 竹内徹也, 本多史憲, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 518 - 518 2010年8月

23pPSA-26 YbT_2Zn_<20>(T:遷移金属)の単結晶育成と電子相関(23pPSA 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

吉内伸吾, 広瀬雄介, 大家政洋, 西村尚人, 太田尚志, 松下昌輝, 安井慎一, 杉山清寛, 本多史憲, 竹内徹也, 萩原政幸, 金道浩一, 芳賀芳範, 山本悦嗣, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 517 - 517 2010年8月

23pPSB-42 反強磁性体Ce_2MgSi_2の圧力効果2(23pPSB 領域8ポスターセッション(f電子系等),領域8(強相関系:高温超伝導,強相関f電子系など))

本多史憲, 吉谷尚久, 広瀬雄介, 竹内徹也, 松林和幸, 上床美也, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 2 ) 537 - 537 2010年8月

Quantum Critical Phenomena in Heavy Fermion Compound YbIr2Zn20

Fuminori Honda, Shinichi Yasui, Shingo Yoshiuchi, Tetsuya Takeuchi, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 ( 8 ) 2010年8月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We measured the electrical resistivity under pressure and magnetic field for a heavy fermion compound YbIr2Zn20 with a cubic cage structure. Metamagnetic transition, which is characteristic in the heavy fermion compounds, occurs at the magnetic field H-m = 97 kOe for H parallel to < 100 > at ambient pressure, shifts to lower magnetic fields with increasing pressure P, and becomes zero at the critical pressure P-c similar or equal to 5.2 GPa. From this experiment, we noted that the metamagnetic transition field Hm is a good tuning parameter to approach the quantum critical point. Correspondingly, the A value of the electrical resistivity rho = rho(0) + AT(2) in the Fermi liquid relation under magnetic field indicates a peak structure at Hm and increases extremely in magnitude from A = 0.29 mu Omega.cm/K-2 at ambient pressure to 380 mu Omega.cm/K-2 at 5.0 GPa under 0 kOe. The present large A value at 5.0 GPa is, however, strongly reduced in magnetic field: 1.45 mu Omega.cm/K-2 at 80 kOe. It is also noted that the residual resistivity is enhanced at 5.0 and 5.5 GPa, but the enhanced resistivity is strongly reduced in magnetic fields. These results indicate that electronic instability is realized at around P-c similar or equal to 5.2 GPa.

DOI： 10.1143/JPSJ.79.083709

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Strong Field Quenching of the Quasiparticle Effective Mass in Heavy Fermion Compound YbCo2Zn20

Masahiro Ohya, Masaki Matsushita, Shingo Yoshiuchi, Tetsuya Takeuchi, Fuminori Honda, Rikio Settai, Toshiki Tanaka, Yasunori Kubo, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 ( 8 ) 2010年8月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We found a metamagnetic like anomaly at H-m similar or equal to 5 kOe in a heavy fermion compound YbCo2Zn20 below the characteristic temperature T-chi max = 0.32K where the ac-susceptibility shows a broad peak, suggesting that an electronic state with a very low Kondo temperature is realized. Interestingly, the metamagnetic like behavior was observed as two peaks at 4.0 and 7.5 kOe at 95 mK in the magnetic field dependence of the electronic specific heat C/T. The extremely large values of the electronic specific heat coefficient gamma similar or equal to 8000 mJ/(K-2.mol) and A = 160 mu m.cm/K-2 in the electrical resistivity rho = rho(0) + AT(2) at H = 0 kOe are most likely due to the very low Kondo temperature. The root A value was, however, found to be strongly reduced from root A = 12.6 (mu Omega.cm/K-2)(1/2) at 0 kOe to 0.145 (mu Omega.cm/K-2)(1/2) at 150 kOe. Therefore, we considered that the corresponding cyclotron effective mass m(c)*, which was determined from the temperature dependence of the de Haas-van Alphen (dHvA) amplitude, is also reduced with increasing magnetic field and is in fact not large, ranging from 2 to 9m(0) at 117 kOe. From the field dependence of root A and m(c)*, we estimated the cyclotron effective mass at 0 kOe to be 100-500m(0), revealing the largest cyclotron mass as far as we know.

DOI： 10.1143/JPSJ.79.083601

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Metamagnetic Behavior in Heavy-Fermion Compound YbIr2Zn20

Tetsuya Takeuchi, Shinichi Yasui, Masatoshi Toda, Masaki Matsushita, Shingo Yoshiuchi, Masahiro Ohya, Keisuke Katayama, Yusuke Hirose, Naohisa Yoshitani, Fuminori Honda, Kiyohiro Sugiyama, Masayuki Hagiwara, Koichi Kindo, Etsuji Yamamoto, Yoshinori Haga, Toshiki Tanaka, Yasunori Kubo, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 ( 6 ) 2010年6月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

The metamagnetic behavior in the heavy-fermion compound YbIr2Zn20 with a cubic structure was studied by magnetization, de Haas-van Alphen (dHvA) oscillation, magnetoresistance, specific heat, thermal expansion, and magnetostriction measurements in single-crystalline samples. A metamagnetic anomaly at H-m similar or equal to 100 kOe was found to exist in all field directions in the cubic crystal structure. The cyclotron effective mass m(c)*, the coefficient A in the Fermi liquid relation of electrical resistivity rho = rho(0) + AT(2), and the electronic specific heat coefficient C/T indicate a peak at the metamagnetic field H-m. The negative thermal expansion and negative volume magnetostriction suggest that the valence of the Yb ion gradually changes from a 4f-itinerant state to a trivalent state with increasing magnetic field, and an almost trivalent state is realized above the metamagnetic field H-m. On the other hand, the topology of the Fermi surface is approximately unchanged below and above H-m in the dHvA experiment.

DOI： 10.1143/JPSJ.79.064609

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Heavy fermion state and quantum criticality

Y. Onuki, R. Settai, F. Honda, N. D. Dung, T. Ishikura, T. Takeuchi, T. D. Matsuda, N. Tateiwa, A. Nakamura, E. Yamamoto, Y. Haga, D. Aoki, Y. Homma, H. Harima, H. Yamagami

PHYSICA B-CONDENSED MATTER 405 ( 9 ) 2194 - 2199 2010年5月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

The heavy fermion state in the f-electron systems is due to competition between the RKKY interaction and the Kondo effect. The typical compound is CeCu(6). To understand the electronic state, we studied the Fermi surface properties via the de Haas-van Alphen (dHvA) experiments and energy band calculations for CeSn(3), CeRu(2)Si(2), UPt(3), and nowadays, transuranium compounds of NpGe(3) and PuIn(3), together with YbCu(2)Si(2). Pressure is also an important technique to control the electronic state. For example, the Neel temperature Try decreases with increasing pressure P and becomes zero at the critical pressure P(c) : T(N) --> 0 for P --> P(c). The typical compound is an antiferromagnet CeRhIn(5), which we studied from the dHvA experiment under pressure. A change of the 4f-electronic state from localized to itinerant is realized at P(c) similar or equal to 2.4 GPa, revealing the first-order phase transition, together with a divergent tendency of the cyclotron mass at P(c). It is stressed that appearance of superconductivity in CeRhIn(5) is closely related to the heavy-fermion state. It is also noted that the parity-mixed novel superconducting state might be realized in a pressure-induced superconductor CeIrSi(3) without inversion symmetry in the crystal structure. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physb.2010.02.006

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Superconducting properties in Rh17S15 under magnetic field and pressure

Rikio Settai, Keisuke Katayama, Hiroshi Muranaka, Tetsuya Takeuchi, Arumugam Thamizhavel, Ilya Sheikin, Y. Onuki

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 71 ( 4 ) 700 - 703 2010年4月

記述言語：英語出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

We have studied superconducting properties by measuring the electrical resistivity and magnetization for a single crystal of Rh17S15 with a superconducting transition temperature T-c=5.4 K. The upper critical field H-c2(0) and the lower critical field H-c1(0) were obtained as 20.5 and 0.0033 T, respectively. Correspondingly, the coherence length and the penetration depth were estimated to be 40 and 4900 angstrom, respectively, indicating that Rh17S15 is a typical type-II superconductor with strong correlations of conduction electrons with a 4d-electron character of Rh atoms. The present electron correlations are formed to be enhanced with increasing pressure. (C) 2009 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jpcs.2009.12.070

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Pressure-induced superconductivity and large upper critical field in the noncentrosymmetric antiferromagnet CeIrGe<inf>3</inf>

F. Honda, I. Bonalde, K. Shimizu, S. Yoshiuchi, Y. Hirose, T. Nakamura, R. Settai, Y. Onuki

Physical Review B - Condensed Matter and Materials Physics 81 ( 14 ) 2010年4月

We report on the discovery of superconductivity in the noncentrosymmetric antiferromagnet CeIrGe3 below 1.5 K at a pressure of 20 GPa. We performed electrical resistivity measurements in single crystals of CeIrGe 3 in the temperature range 0.04-300 K at pressures up to 24 GPa. From these measurements we deduced the P-T phase diagram. The data imply a crossover from localized to itinerant 4f electrons of the type caused by a Kondo-lattice phenomenon as pressure increases. The antiferromagnetic phase weakens with pressure and eventually vanishes above 22 GPa, indicative of the occurrence of a quantum critical point. Superconductivity appears inside the antiferromagnetic phase near this critical point. After the disappearance of the magnetic ordering a non-Fermi-liquid behavior is observed. Resistivity measurements taken at 24 GPa in magnetic fields up to 8 T strongly suggest that CeIrGe3 has a very large upper critical field for H ∥ [001]. © 2010 The American Physical Society.

DOI： 10.1103/PhysRevB.81.140507

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Low-Temperature Magnetic Orderings and Fermi Surface Properties of LaCd11, CeCd11, and PrCd11 with a Caged Crystal Structure

Shingo Yoshiuchi, Tetsuya Takeuchi, Masahiro Ohya, Keisuke Katayama, Masaki Matsushita, Naohisa Yoshitani, Naoto Nishimura, Hisashi Ota, Naoyuki Tateiwa, Etsuji Yamamoto, Yoshinori Haga, Hiroshi Yamagami, Fuminori Honda, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 ( 4 ) 2010年4月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We succeeded in growing single crystals of cage-structure compounds RCd11 (R: La, Ce, and Pr) and precisely studied their low-temperature magnetic and electronic properties by measuring electrical resistivity, magnetic susceptibility, magnetization, specific heat, and the de Haas-van Alphen (dHvA) effect. We found antiferromagnetic ordering at 0.44 and 0.39K in CeCd11 and PrCd11, respectively, and clarified the magnetic phase diagrams of the compounds. In addition, low-lying crystalline electric field (CEF) schemes were proposed from the specific heat results of both compounds. From the present study, the antiferromagnetic ordering in PrCd11 is found to be of the exchange-induced type with a singlet ground state. From the dHvA experiment, we detected small dHvA branches ranging from 7 x 10(5) to 2 x 10(7) Oe, which correspond to small Fermi surfaces. This is mainly due to a small Brillouin zone based on a large unit cell. Moreover, the dHvA frequencies and cyclotron masses are approximately the same among RCd11, revealing a localized character of 4f electrons in CeCd11 and PrCd(11)A.

DOI： 10.1143/JPSJ.79.044601

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21aPS-75 正方晶化合物RCu_2Si_2(R=Pr,Dy)の四極子効果(21aPS 領域8ポスターセッション(f電子系),領域8(強相関系:高温超伝導,強相関f電子系など))

後藤沙織, 三本啓輔, 荒木幸治, 赤津光洋, 根本祐一, 後藤輝孝, DUNG Nguyen Duc, 松田達磨, 芳賀芳範, 太田有基, 杉山清寛, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 1 ) 618 - 618 2010年3月

RCd11(R:希土類)とYbT2Zn20(T:遷移金属)の単結晶育成と電子相関

吉内伸吾, 片山敬亮, 広瀬雄介, 戸田雅敏, 吉谷尚久, 大家政洋, 中村太一, 西村尚人, 太田尚志, 松下昌輝, 安井慎一, 杉山清寛, 本多史憲, 竹内徹也, 山上浩志, 萩原政幸, 金道浩一, 芳賀芳範, 山本悦嗣, 摂待力生, 大貫惇睦

日本物理学会講演概要集 65 ( 1 ) 672 2010年3月

YbIr2Zn20とその関連物質の強磁場磁化

杉山清寛, 戸田雅敏, 広瀬雄介, 中村太一, 吉内伸吾, 松下昌輝, 安井慎一, 竹内徹也, 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 65 ( 1 ) 673 2010年3月

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