MISC - 摂待　力生

23pWJ-8 セリウム化合物における圧力誘起超伝導とフェルミ面(領域8,領域3,領域6,領域7,領域10合同シンポジウム主題:高圧力物性科学の新展開,領域6,金属,超低温,超伝導・密度波)

摂待 力生

日本物理学会講演概要集   62 ( 2 )   829 - 829   2007年8月

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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21pPSA-93 反転対称性のない超伝導体CeIrSi_3, LaIrSi_3におけるNMR, NQR(領域8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)

小原 崇, 藤井 拓也, 原田 淳之, 椋田 秀和, 北岡 良雄, 奥田 悠介, 摂待 力生, 大貫 惇睦

日本物理学会講演概要集   62 ( 2 )   570 - 570   2007年8月

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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21pPSA-98 ピエゾ素子を用いたCe系超伝導体の点接合分光(領域8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   62 ( 2 )   571 - 571   2007年8月

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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21pPSA-87 CePt_3Siの圧力下超伝導特性(領域8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)

青木 義弘, 住山 昭彦, 本山 岳, 小田 祺景, 安田 敬, 摂待 力生, 大貫 惇睦

日本物理学会講演概要集   62 ( 2 )   568 - 568   2007年8月

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記述言語：日本語   出版者・発行元：一般社団法人日本物理学会  

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空間反転対称性が破れた重い電子系CePt3Siの超伝導

竹内 徹也, 摂待 力生, 大貫 惇睦

固体物理   42 ( 7 )   431 - 441   2007年7月

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記述言語：日本語   出版者・発行元：アグネ技術センタ-  

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Unconventional heavy-fermion superconductivity of a new transuranium compound NpPd5Al2

Dai Aoki, Yoshinori Haga, Tatsuma D. Matsuda, Naoyuki Tateiwa, Shugo Ikeda, Yoshiya Homma, Hironori Sakai, Yoshinobu Shiokawa, Etsuji Yamamoto, Akio Nakamura, Rikio Setta, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 6 )   2007年6月

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記述言語：英語   出版者・発行元：PHYSICAL SOC JAPAN  

We succeeded in growing a new transuranium compound NpPd5Al2 with the tetragonal crystal structure by the Pb-flux method, and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpPd5Al2 is found to be a paramagnetic heavy-fermion superconductor with strong coupling Delta C/gamma T-c = 2.33 [T-c = 4.9 K and gamma = 200 mJ/(K(2 center dot)mol)]. The upper critical field H-c2 at 0K is large and highly anisotropic: H-c2(0) = 37 kOe for H \\ [100] and H-c2(0) = 143 kOe for H \\ [001]. H-c2 is found to be strongly suppressed by the magnetic field, and the magnetization curve indicates a step-like increase at H-c2, which are due to the paramagnetic effect. The low-temperature electronic specific heat approximately follows the T-3-dependence, indicating the existence of point nodes in the energy gap. The d-wave superconductivity with point nodes is most likely realized in this compound.

DOI： 10.1143/JPSJ.76.063701

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Magnetic properties and crystalline electric field scheme in RRhIn 5 (R: rare earth)

Nguyen Van Hieu, Tetsuya Takeuchi, Hiroaki Shishido, Chie Tonohiro, Tsutomu Yamada, Hiroshi Nakashima, Kiyohiro Sugiyama, Rikio Settai, Tatsuma D. Matsuda, Yoshinori Haga, Masayuki Hagiwara, Koichi Kindo, Shingo Araki, Yasuo Nozue, Yoshichika Onuki

Journal of the Physical Society of Japan   76 ( 6 )   2007年6月

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記述言語：英語  

A series of ternary compounds RRhIn 5 (R: rare earth) has been grown in the single crystalline form by means of the flux method. The magnetic properties of these compounds were investigated by measuring the lattice parameter, electrical resistivity, specific heat, magnetic susceptibility and magnetization. All the compounds crystallize in the tetragonal HoCoGa 5-type structure. Most of these compounds order antiferromagnetically at low temperatures, except when R = Y, La, Pr, and Yb. The observed temperature dependence of the specific heat and the anisotropic features in the magnetic susceptibility and magnetization have been analyzed on the basis of the crystalline electric field (CEF) model. The overall energy splitting of the CEF scheme in RRhIn 5 is estimated to be in the range from 44 to 330 K. The magnetic properties are discussed on the basis of the sign of the CEF parameter. ©2007 The Physical Society of Japan.

DOI： 10.1143/JPSJ.76.064702

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Anomalous behaviors in transport properties of CeCu6 and CeCu5.9Au0.1

Takahiro Namiki, Hideyuki Sato, Hitoshi Sugawara, Yuji Aoki, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 5 )   2007年5月

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記述言語：英語   出版者・発行元：PHYSICAL SOC JAPAN  

We have investigated the thermoelectric power (TEP) and Hall coefficient (R-H), along with the field dependence of Hall resistivity (rho(H)) and magnetoresistance (MR) in single crystals of CeCu5.9Au0.1 and CeCu6. In both compounds, R-H is highly anisotropic with respect to the field direction below similar to 10 K. For H vertical bar vertical bar [001], a negative minimum in rho(H) and a positive MR peak grow at low temperatures near 1.7T, where a metamagnetic-like anomaly was reported for CeCu6. The Au substitution induces drastic changes in R-H depending on the magnetic field direction, which is discussed in correlation with the predicted change in the Fermi surface across the quantum critical point. In CeCu5.9Au0.1, an unexpectedly large positive MR has been found at low temperatures and in low fields; its origin is discussed in comparison with the Hall resistivity. For all the principal axes, the Au-substitution effect on TEP is minor in both magnitude and anisotropy down to similar to 1.5 K, suggesting no essential change in the electronic structure in the energy region above a few K.

DOI： 10.1143/JPSJ.76.054708

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Magnetic and superconducting properties of LaIrSi3 and CeIrSi3 with the non-centrosymmetric crystal structure

Yusuke Okuda, Yuichiro Miyauchi, Yuki Ida, Yuuji Takeda, Chie Tonohiro, Yasuhiro Oduchi, Tsutomu Yamada, Nguyen Due Dung, Tatsuma D. Matsuda, Yoshinori Haga, Tetsuya Takeuchi, Masayuki Hagiwara, Koichi Kindo, Hisatomo Harima, Kiyohiro Sugiyama, Rikio Settai, Yoshichika Onuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   76 ( 4 )   2007年4月

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記述言語：英語   出版者・発行元：PHYSICAL SOC JAPAN  

Single crystals of LaIrSi3 and CeIrSi3 were grown by the Czochralski pulling method in a tetra-arc furnace and the magnetic and superconducting properties, together with superconductivity in CeIr1-xCoxSi3, were clarified by measuring the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas-van Alphen (dHvA) effect. From the results of the dHvA experiment for LaIrSi3, the Fermi surface is found to split into two Fermi surfaces due to the spin-orbit interaction arising from the non-centrosymmetric crystal structure, which are separated by about 1000K. Similar split Fermi surfaces are expected in the antiferromagnet CeIrSi3. The electronic state of CeIrSi3 is tuned from the anti ferromagnetic state to the superconducting state by applying pressure. The upper critical field H-c2(0) at a pressure of 2.65 GPa is found to be highly anisotropic: H-c2(0) = 95 kOe for H vertical bar vertical bar [110] and H-c2(0) similar or equal to 300 kOe for H vertical bar vertical bar [001], with the superconducting transition temperature T-sc similar or equal to 1.6 K. The large magnitude and anisotropy of H-c2(0) in CeIrSi3 are consistent with the theoretical prediction for superconductivity in the non-centrosymmetric crystal structure. Superconductivity is also observed at ambient pressure in CeIr1-xCoxSi3.

DOI： 10.1143/JPSJ.76.044708

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de Haas-van Alphen effect and the electronic state in CePtAl

T. Ueda, H. Harima, T. Yasuda, T. Kawai, R. Settai, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   391 - 392   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We have done the de Haas-van Alphen (dHvA) experiment for a canted ferromagnet CePtAl. The detected dHvA branches are so many in number, revealing the multiply connected small Fermi surfaces. The cyclotron effective masses are relatively large, ranging from 0.4m(0) to 10m(0). These Fermi surfaces are approximately explained on the basis of the results of energy band calculations of LaPtAl. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.098

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Magnetic properties and Fermi surfaces in NpIn3

D. Aoki, H. Yamagami, Y. Homma, H. Sakai, S. Ikeda, Y. Shiokawa, E. Yamamoto, A. Nakamura, Y. Haga, R. Settai, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   386 - 388   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We grew high-quality single crystals of NpIn3 by the Indium-flux method and measured the magnetization and de Haas-van Alphen (dHvA) effect. The ferromagnetic and antiferromagnetic transitions were observed at T-C = 14K and T-N = 10 K, respectively. The dHvA oscillations were detected at high fields, where the ferromagnetic state is realized. Three fundamental dHvA branches were clearly observed, which were discussed on the basis of the 5f-localized model. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.093

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de Haas-van Alphen effect of CeIr1-xRhxIn5

H. Shishido, R. Settai, T. Kawai, H. Harima, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   303 - 304   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We have studied the de Haas-van Alphen (dHvA) effect in CeIr1-xRhxIn5 (x= 0.03, 0.05 and 0.1). The dHvA frequencies are unchanged in the concentration range from x 0 to 0.1. The cyclotron effective mass, however, increases with increasing x. These results are consistent with the recent NQR measurement, indicating that CeIr0.Rh-7(0).In-3(5) is located at the antiferromagnetic quantum critical point. (c) 2006 Published by Elsevier B.V.

DOI： 10.1016/j.jmmm.2006.10.051

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Magnetic and superconducting properties of CeIrSi3 and CeIrGe3 without inversion symmetry

Y. Okuda, I. Sugitani, H. Shishido, T. Yamada, A. Thamizhavel, E. Yamamoto, T. D. Matsuda, Y. Haga, T. Takeuchi, R. Settai, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   563 - 565   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We measured the electrical resistivity in antiferromagnets CeIrSi3 (a Neel temperature T-N = 5.0 K) and CeIrGe3 (T-N1 = 8.7 K, T-N2 = 4.7 K) under pressure. In CeIrSi3, superconductivity was found in a wide pressure region from 1.8 GPa to about 3.5 GPa, where the superconducting transition temperature is T-SC = 1.6 K at a critical pressure P-c similar or equal to 2.5 GPa at which the Neel temperature becomes zero. On the other hand, the antiferromagnetic ordering of CeIrGe3 is stable up to 8 GPa. (c) 2006 Published by Elsevier B.V.

DOI： 10.1016/j.jmmm.2006.10.151

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Drastic change of the electronic states at the quantum critical point in heavy fermions

R. Settai, H. Shishido, T. Kubo, S. Araki, T. C. Kobayashi, H. Harima, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   541 - 547   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We studied the change of the Fermi surface properties in antiferromagnets CeIn3 and CeRhIn5 via the dHvA experiments under pressure. We found the abrupt change of the Fermi surface at the critical pressure P-c, where the magnetic ordering state changes to the paramagnetic one. The change of the Fermi surface indicates that the 4f-electron character is changed from localized to itinerant in CeIn3 and CeRhIn5 at P-c. Namely, the 4f-electron contributes to the volume of the Fermi surface above P-c. Interestingly, the pressure-induced heavy fermion state with large effective mass was observed around P-c, where the pressure-induced superconductivity appears. We also discuss the Fermi surface properties in the system without inversion symmetry in the crystal structure as in CePt3Si and CeTX3 (T:Co, Ir, Rh, X: Si, Ge). The spin-orbit interaction due to the lack of inversion symmetry brings about a splitting of the Fermi surface, which is important for considering the formation of Cooper pair. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.11.197

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Anisotropic magnetic properties of Ce2Pd3Si5

N. D. Dung, Y. Haga, T. D. Matsuda, A. Thamizhavel, Y. Okuda, T. Takeuchi, K. Sugiyama, M. Hagiwara, K. Kindo, R. Settai, Y. Oenuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1558 - 1560   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We succeeded in growing a single crystal of Ce2Pd3Si5 with the orthorhombic crystal structure by the Sn-flux method and measured the electrical resistivity, magnetic susceptibility and specific heat. The magnetic easy-axis corresponds to the [001] direction, while the [100] and [010] directions are hard-axes. The crystalline electric field (CEF) scheme is proposed for Ce2Pd3Si5. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.563

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Magnetism of filled skutterudites under high magnetic fields

T. Yamada, H. Nakashima, K. Sugiyama, M. Hagiwara, K. Kindo, K. Tanaka, D. Kikuchi, Y. Aoki, H. Sugawara, H. Sato, R. Settai, Y. Onuki, H. Harima

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   252 - 254   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We measured the high-field magnetization M for skutterudite compounds of a paramagnet PrFe4Sb12 and a ferromagnet SmOs4Sb12 to investigate the characteristic magnetic properties. In PrFe4Sb12, we observed a peak structure in the dM/dH curve, which might be a level crossing effect between the singlet ground state and the excited state with a splitting energy of about 20K in the crystalline electric field (CEF) scheme. In SmOs4Sb12, the anisotropy of magnetization for H parallel to 1 0 0 parallel to and [1 1 0] was not observed, which is inconsistent with the quartet ground state in the CEF scheme. (c) 2006 Published by Elsevier B.V.

DOI： 10.1016/j.jmmm.2006.10.030

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Novel phase diagram of antiferromagnetism and superconductivity in CeRhIn5

M. Yashima, S. Kawasaki, H. Mukuda, Y. Kitaoka, H. Shishido, R. Settai, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   322 - 324   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We report on the pressure (P)-induced phase diagram of antiferromagnetism (AFM) and superconductivity (SC) which emerges at their border at zero magnetic. field. The nuclear-quadrupole- resonance (NQR) measurements have revealed that AFM can take place in the superconducting state with Tc similar to 2.1K at P 2.05 GPa. The present experiments have, for the. first time, demonstrated that AFM phase, AFM + SC uniformly coexisting phase, SC phase and paramagnetic phase all contact with each other at T-tetra similar to 2.1K and Ptetra similar to 2GPa which evidence the existence of the tetracritical point in the P-T phase diagram of AFM and SC in CeRnIn5. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.018

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Magnetic properties in RRhIn5 (R = rare earth)

N. V. Hieu, H. Shishido, H. Nakashima, K. Sugiyama, R. Settai, T. Takeuchi, T. D. Matsuda, Y. Haga, M. Hagiwara, K. Kindo, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   1721 - 1723   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We succeeded in growing single crystals of RRhIn5 (R: rare earth) and measured the magnetic susceptibility and magnetization. The lattice constants of RRhIn5 with the tetragonal structure are well understood from a viewpoint of the lanthanide contraction, except YbRhIn5 with the divalent Yb ion. Most of RRhIn5 compounds order antiferromagnetically. NdRhIn5 indicates two metamagnetic transitions at H-m1 = 7.2 and H-m2 = 9.6 T below T-N for the magnetic field along the [001] direction. The saturation moment of 2.5 mu(B)/Nd is in good agreement with a staggered Nd moment determined by the neutron scattering experiment. The similar metamagnetic transitions were observed in TbRhIn5, DyRhIn5 and HoRhIn5, (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.546

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Pressure-induced superconductivity in CeCoGe3 without inversion symmetry

R. Settai, I. Sugitani, Y. Okuda, A. Thamizhavel, M. Nakashima, Y. Onuki, H. Harima

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   844 - 846   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We investigated the pressure-induced superconductivity for an antiferromagnet CeCoGe3 without inversion symmetry in the crystal structure. We found the pressure-induced superconductivity in CeCoGe3 with the superconducting transition temperature T-sc = 0.7K at 5.5 GPa. CeCoGe3 belongs to a new type of superconductor without inversion symmetry in the crystal structure as in CePt3Si, UIr, CeRhSi3 and CeIrSi3. (c) 2006 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jmmm.2006.10.717

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Magnetic properties of Ce3T4Sn13 and Pr3T4Sn13 (T = Co and Rh) single crystals

Y. Oduchi, C. Tonohiro, A. Thamizhavel, H. Nakashima, S. Morimoto, T. D. Matsuda, Y. Haga, K. Sugiyama, T. Takeuchi, R. Settai, M. Hagiwara, Y. Onuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS   310 ( 2 )   249 - 251   2007年3月

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記述言語：英語   出版者・発行元：ELSEVIER SCIENCE BV  

We succeeded in growing single crystals of ternary compounds Ce3Rh4Sn13, Pr3Co4Sn13 and Pr3Rh4Sn13, and studied magnetic properties by the specific heat, magnetic susceptibility, magnetization, thermal expansion and electrical resistivity measurements. Ce3Rh4Sn13 was found to be an antiferromagnet with transition temperatures T-N1 = 1.2K and T-N2 = 2.0K, while Pr3Co4Sn13 and Pr3Rh4Sn13 have no phase transition down to 0.2K, indicating a singlet ground state for both compounds. (c) 2006 Published by Elsevier B.V.

DOI： 10.1016/j.jmmm.2006.10.026

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