研究者詳細 - 摂待　力生

MISC - 摂待　力生

分割表示 1,079 件中 201 - 220 件目／全件表示 >>

25aPS-135 LaPt_3Siの磁場中磁化率測定(25aPS 領域8ポスターセッション(磁性(f電子系)1),領域8(強相関系:高温超伝導,強相関f電子系など))

塩月聖博, 本山岳, 小田祺景, 山口明, 住山昭彦, 竹内徹也, 安田敬, 摂待力生, 大貫惇睦

日本物理学会講演概要集 66 ( 1 ) 545 - 545 2011年3月

25pEC-8 YbT_2Zn_<20>(T=Ir,Co)の極低温磁化(25pEC Ce・Yb系重い電子,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 66 ( 1 ) 551 - 551 2011年3月

25pEC-11 Rt_2Zn_<20>(R:希土類,T:Co,Rh,Ir)の比熱による電子状態の研究(25pEC Ce・Yb系重い電子,領域8(強相関系:高温超伝導,強相関f電子系など))

竹内徹也, 吉内伸吾, 田賀悠記, 大家政洋, 松下昌輝, 安井禎一, 本多史憲, 摂待力生, 大貫惇睦

日本物理学会講演概要集 66 ( 1 ) 551 - 551 2011年3月

25pED-8 Rh_<17>S_<15>超伝導体の高分解能光電子分光(25pED 超伝導物質,領域8(強相関系:高温超伝導,強相関f電子系など))

福井仁紀, 吉田力矢, 中村祥明, 岡崎宏之, 加藤有香子, 室隆桂之, 摂待力生, 大貫惇睦, 播磨尚朝, 平井正明, 村岡祐治, 横谷尚睦

日本物理学会講演概要集 66 ( 1 ) 554 - 554 2011年3月

25pEC-14 UT_2Zn_<20>(T:遷移金属)の強磁場磁化(25pEC Ce・Yb系重い電子,領域8(強相関系:高温超伝導,強相関f電子系など))

杉山清寛, 広瀬雄介, 榎健太郎, 吉内伸吾, 安井慎一, 松下昌輝, 山本悦嗣, 芳賀芳範, 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 66 ( 1 ) 552 - 552 2011年3月

26aEC-11 Yb_2Pt_2Pbの強磁場磁化(26aEC Yb系,領域8(強相関系:高温超伝導,強相関f電子系など))

岩川健, 廣瀬雄介, 榎健太郎, 杉山清寛, 竹内徹也, 本多史憲, 萩原政幸, 金道浩一, 中野岳仁, 野末泰夫, 摂待力生, 大貫惇睦

日本物理学会講演概要集 66 ( 1 ) 584 - 584 2011年3月

25pEC-12 RIr_2Zn_<20>(R:Yb,Pr,Lu)のドハース・ファンアルフェン効果とフェルミ面(25pEC Ce・Yb系重い電子,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 66 ( 1 ) 552 - 552 2011年3月

Magnetic and Superconducting Properties of CeRhGe2 and CePtSi2

Yusuke Hirose, Naoto Nishimura, Fuminori Honda, Kiyohiro Sugiyama, Masayuki Hagiwara, Koichi Kindo, Tetsuya Takeuchi, Etsuji Yamamoto, Yoshinori Haga, Masato Matsuura, Kazuma Hirota, Akira Yasui, Hiroshi Yamagami, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 80 ( 2 ) 2011年2月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

We synthesized a new compound of CeRhGe2 with the orthorhombic CeNiSi2-type structure. By measuring the electrical resistivity, magnetic susceptibility, magnetization, specific heat, and neutron scattering for single crystals, CeRhGe2 was found to order antiferromagnetically below T-N = 7.6 K with an ordered moment of 1.3 mu(B)/Ce oriented along the magnetic easy-axis of the c-axis. Similar measurements were also carried out for CePtSi2 single crystals. From the experimental results of anisotropic magnetic susceptibility and magnetization, the crystalline electric field (CEF) scheme was obtained for CeRhGe2 and CePtSi2, together with the similar compound CeNiGe2. Furthermore, we carried out pressure experiments by measuring the electrical resistivity of CePtSi2 and CeRhGe2. In the quantum critical region where the Neel temperature becomes zero, we observed superconductivity in CePtSi2 and most likely CeRhGe2, at 1.5 and 7.1 GPa, respectively. The upper critical field of CePtSi2 was found to be highly anisotropic with respect to the three principal field directions.

DOI： 10.1143/JPSJ.80.024711

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Single crystal growth and physical properties of ternary uranium compounds UM2Al10 (M=Fe, Ru and Os)

Takashi Sugai, Yoshinori Haga, Tatsuma D. Matsuda, Etsuji Yamamoto, Naoyuki Tateiwa, Fuminori Honda, Rikio Settai, Yoshichika Onuki

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 2011年

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

We investigated the ternary uranium compounds UM2Al10 (M = Fe, Ru and Os) with the orthorhombic YbFe2Al10-type crystal structure. URu2Al10 and UOs2Al10 are new compounds grown for the first time. These compounds show no ordering despite the Curie Weiss behavior at high temperatures. The temperature dependence of the electrical resistivity, the specific heat and the magnetic susceptibility indicate that UM2Al10 (M = Fe, Ru and Os) has non-magnetic ground states.

DOI： 10.1088/1742-6596/273/1/012122

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Metamagnetic behavior in a heavy fermion compound YbCo2Zn20

Tetsuya Takeuchi, Masahiro Ohya, Shingo Yoshiuchi, Masaki Matsushita, Fuminori Honda, Rikio Settai, Yoshichika Onuki

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 2011年

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

We studied an electronic state at low temperatures by measuring the specific heat and ac-susceptibility under magnetic fields for a heavy fermion compound YbCo2Zn20. The magnetic specific heat in the form of C-mag/T increases steeply and exhibits an extremely large value 8 J/(K-2.mol) below 0.2 K, which corresponds to an electronic specific heat coefficient with a very low Kondo temperature of 0.2-1 K. The magnetic entropy increases rapidly at higher temperatures up to 10 K and reaches R In 8 at 50-60 K, which corresponds to a small crystalline-electric-field (CEF) splitting energy. In addition, we found a metamagnetic anomaly at H-m = 5.7 kOe below the characteristic temperature T-chi max = 0.32 K, where the temperature dependence of the ac-susceptibility shows a broad peak. Interestingly, the metamagnetic behavior was observed as the double peak at 4.0 and 7.5 kOe in the magnetic field dependence of the specific heat C/T at 95 mK.

DOI： 10.1088/1742-6596/273/1/012059

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Soft X-ray angle-resolved photoemission study of YbCu2Ge2

A. Yasui, S. -I. Fujimori, I. Kawasaki, T. Okane, Y. Takeda, Y. Saitoh, H. Yamagami, A. Sekiyama, R. Settai, T. D. Matsuda, Y. Haga, Y. Onuki

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 2011年

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

Soft X-ray photoemission spectroscopies have been performed on YbCu2Ge2, which is thought to be a Yb divalent system, to investigate its bulk electronic structure including Yb 4f electrons. Small but finite Yb3+ multiplet peaks were found at 6-12 eV in the angle-integrated spectrum, suggesting that it is a valence fluctuation compound. An "anti-crossing" Yb 4f bands with conduction bands were observed in the angle-resolved spectrum. This is the evidence that the Yb 4f electrons form a band state through the hybridization with Ge 4p and Cu 3d electrons.

DOI： 10.1088/1742-6596/273/1/012067

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de Haas-van Alphen effect in SmOs4P12

S. Tanaka, M. Sakoda, E. Matsuoka, H. Sugawara, R. Settai, Y. Onuki

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 2011年

Relation between Metamagnetic Transition and Quantum Critical Point in Heavy Fermion Compound YbIr2Zn20

Y. Onuki, S. Yasui, S. Yoshiuchi, M. Ohya, M. Matsushita, Y. Hirose, T. Takeuchi, F. Honda, R. Settai, K. Sugiyama, E. Yamamoto, Y. Haga

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 2011年

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

We measured the electrical resistivity in magnetic field H under pressure P for a heavy fermion compound YbIr2Zn20. The quantum critical point is found to be defined as an electronic state where the metamagnetic transition field H-m becomes zero. This is realized at P-c similar or equal to 5.2 GPa. The most characteristic feature in the quantum critical pressure region is an anomalously large A value of the electrical resistivity rho = rho(0) + AT(2), reaching A = 380 mu Omega.cm/K-2 at 5.0 GPa, which is, however, strongly reduced with increasing the magnetic field: A = 1.45 mu Omega.cm/K-2 at 80 kOe. From the result of the de Haas-van Alphen experiment at ambient pressure, the corresponding cyclotron effective mass of conduction electrons at 5.0 GPa is 400 - 500 m(0) (m(0): rest mass of an electron).

DOI： 10.1088/1742-6596/273/1/012013

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Metamagnetic Transition in Heavy Fermion Compounds YbT2Zn20 ( T:Co, Rh, Ir )

Yusuke Hirose, Masatoshi Toda, Shingo Yoshiuchi, Shinichi Yasui, Kiyohiro Sugiyama, Fuminori Honda, Masayuki Hagiwara, Koichi Kindo, Rikio Settai, Yoshichika Onuki

INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 2011年

記述言語：英語出版者・発行元：IOP PUBLISHING LTD

We measured the magnetization in high magnetic fields up to 500kOe, together with the magnetic susceptibility, ac-susceptibility and magnetoresistance for heavy fermion compounds YbT2Zn20 ( T : Co, Rh, Ir ). The metamagnetic behaviour or an abrupt nonlinear increase of magnetization was observed at the magnetic field H-m at temperatures lower than a characteristic temperature T chi(max) below which the magnetic susceptibility becomes almost constant : T chi(max) = 7.4K and H-m = 97kOe in YbIr2Zn20, T chi(max) = 5.3K and H-m = 64kOe in YbRh2Zn20, and T chi(max) = 0.32K and H-m = 6kOe in YbCo2Zn20. From the present data and the data in several Ce and U heavy fermion compounds, a simple relation between T chi(max) and H-m was obtained : H-m(kOe) = 15T chi(max) (K).

DOI： 10.1088/1742-6596/273/1/012003

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Metamagnetic behaviour in CeCu6 (Proceedings of the International Conference on Heavy Electrons 2010 (ICHE2010))

Hirose Yusuke, Honda Fuminori, Settai Rikio

Journal of the Physical Society of Japan 80 SA065 - 1〜3 2011年

Pressure-induced superconductivity in non-centrosymmetric compound CeIrGe3

Fuminori Honda, Ismardo Bonalde, Shingo Yoshiuchi, Yusuke Hirose, Taichi Nakamura, Katsuya Shimizu, Rikio Settai, Yoshichika Onuki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 S543 - S544 2010年12月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We have carried out electrical resistivity experiments on the non-centrosymmetric compound CeIrGe3 under high pressures up to 24 GPa. CeIrGe3 is an antiferromagnet with the Neel temperature T-N1 = 8.5 K and a successive magnetic transition at T-N2 = 4.7 K at ambient pressure. With increasing pressure. T-N1 and T-N2 merge around 3 GPa, becomes unchanged up to 10 GPa, and indicates a step-like decrease up to 20 GPa. Further increasing pressure, we have found superconductivity above 20 GPa with a transition temperature of 1.6 K at 24 GPa. The upper critical field for the magnetic field along the tetragonal [001] direction is expected to be much larger than 15T. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2009.10.126

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Josephson Effect between Noncentrosymmetric LaPt3Si and a Conventional Superconductor

Yoshihiro Aoki, Akihiko Sumiyama, Masahiro Shiotsuki, Gaku Motoyama, Akira Yamaguchi, Yasukage Oda, Takashi Yasuda, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 79 ( 12 ) 2010年12月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

The Josephson effect between LaPt3Si and Al has been investigated for junctions on the (100) and (001) faces of LaPt3Si single crystals and a polycrystal. In the magnetic-field dependence of the Josephson critical current, the anomaly previously reported for CePt3Si appeared; an oscillating pattern without a dominant maximum peak at zero field was observed for the junction on the (001) face. This cannot be interpreted as the Josephson effect between conventional s-wave superconductors and suggests that the origin of the anomaly lies in the noncentrosymmetric crystal structure.

DOI： 10.1143/JPSJ.79.124707

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Huge upper critical field in the superconductor with non-centrosymmetric crystal structure CeCoGe3

M-A Measson, H. Muranaka, T. D. Matsuda, T. Kawai, Y. Haga, G. Knebel, D. Aoki, G. Lapertot, F. Honda, R. Settai, J-P Brison, J. Flouquet, K. Shimizu, Y. Onuki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 S536 - S538 2010年12月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We report the upper critical field, H-c2 of the non-centrosymmetric compound CeCoGe3 by resistivity measurements under high pressure of 7.1 GPa, for H along c and a axis, and for a magnetic field up to 17T. H-c2 is very anisotropic, saturating at low temperature for H along the a axis and linear for H along the c axis. Very high H-c2(T) is observed for H along the c axis, with a huge value of the slope dH(c2)/dT = -47 +/- 1.3 T/K, the highest ever reported if normalized to the superconducting temperature of 0.65 K. This is most probably related to a conjunction of a heavy fermionic state and the absence of the Pauli limitation. A fit of H-c2(7) shows that the curves for a and c axis can be reproduced with a moderate coupling Eliashberg theory. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2009.11.013

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Meissner effect of heavy-fermion superconductor CePt3Si under pressure

Y. Aoki, A. Sumiyama, G. Motoyama, Y. Oda, T. Yasuda, R. Settai, Y. Onuki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 S554 - S555 2010年12月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

We have investigated the pressure dependence of dc susceptibility chi(dc) of heavy-fermion superconductor CePt3Si for a single crystal and a poly-crystal that show a similar specific heat anomaly at T-c similar to 0.4 K. When coexisting antiferromagnetism disappears at pressures above P-c similar to 0.6 GPa, the Meissner fraction of the single crystal becomes twice or third times as large as that below P-c depending on the magnetic field direction. The poly-crystal, on the other hand, has not shown such an anomaly, possibly because the distribution of local pressure that seems wider than that in the single crystal causes the remains of antiferromagnetic phase even above P-c. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2009.12.069

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Comparison of Josephson effect of heavy-fermion superconductor CeTIn5 (T = Co, Ir)

A. Sumiyama, Y. Tsuji, N. Ikeda, Y. Oda, H. Shishido, R. Settai, Y. Onuki

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 470 S577 - S578 2010年12月

記述言語：英語出版者・発行元：ELSEVIER SCIENCE BV

The Josephson effect between a single crystal CeTIn5 (T = Co, Ir) and an s-wave superconductor has been investigated for a current flow along the c-axis of CeTIn5. For CeCoIn5, the magnetic-field modulation of the Josephson critical current has shown an oscillating pattern, which does not contradict with d(x2-y2) superconductivity, while a Fraunhofer-like pattern has been observed for CeIrIn5, suggesting that an s-wave component is induced on the (001) face of CeIrIn5. (C) 2009 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physc.2009.12.020

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