Thermodynamical Study on the Heavy-Fermion Superconductor PrOs_4Sb_<12> : Evidence for Field-Induced Phase Transition
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概要
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We report measurements of low-temperature specific heat on the 4f^2-based heavy-fermion superconductor PrOs_4Sb_<12>. In magnetic fields above 4.5 T in the normal state, distinct anomalies are found which demonstrate the existence of a field-induced ordered phase (FIOP). The Pr nuclear specific heat indicates an enhancement of the 4f magnetic moment in the FIOP. Utilizing a Maxwell relation, we conclude that anomalous entropy, which is expected for a single-site quadrupole Kondo model, is not concealed below 0.16 K in zero field. We also discuss two possible interpretations of the Schottky-like anomaly at 〜3 K, i.e., a crystalline-field excitation or a hybridization gap formation.
- 社団法人日本物理学会の論文
- 2002-09-15
著者
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SATO Hideyuki
Department of Physics, Tokyo Metropolitan University
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SUGAWARA Hitoshi
Department of Physics, Tokyo Metropolitan University
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AOKI Yuji
Department of Physics, Tokyo Metropolitan University
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Sanada Shotaro
Department Of Physics Tokyo Metropolitan University
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Saha S
Tokyo Metropolitan Univ. Tokyo
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Saha S
Tokyo Metropolitan Univ. Tokyo Jpn
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NAMIKI Takahiro
Department of Physics, Tokyo Metropolitan University
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Saha S
Department Of Physics Tokyo Metropolitan University
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Nakama T
Graduate School Of Science Tokyo Metropolitan University
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Aoki Yuji
Department Of Chemistry Faculty Of Science Gakushuin University
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Ohsaki Shuji
Department Of Physics Tokyo Metropolitan University
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Toyota N
Physics Department Graduate School Of Science Tohoku University
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Tateiwa Naoyuki
Graduate School Of Science Tohoku University:(present) Department Of Physical Science Graduate Schoo
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SAHA Shanta
Department of Physics, Tokyo Metropolitan University
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Shiozawa Hidetsugu
Department Of Physics Tokyo Metropolitan University
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Nakano Toshihiro
Department Of Quantum Matter Adsm Hiroshima University
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Sakata H
Department Of Physics Tokyo Institute Of Technology
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Nakanishi T
Graduate School Of Science Tokyo Metropolitan University
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Sato Hideyuki
Department Of Cardiology Osaka University Graduate School Of Medicine
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Nakama T
Advanced Technol. Inst. Inc. Tokyo Jpn
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Sato Hideyuki
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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SUGAWARA Hitoshi
Department of Mathematical and Natural Sciences, Faculty of Integrated Arts and Sciences, The University of Tokushima
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Namiki Takahiro
Department of Electrical and Electronic Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan
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Sugawara Hitoshi
Department of General Internal Medicine, Omiya Medical Center, Jichi Medical University
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