Magnetic Criticality and Unconventional Superconductivity in CeCoIn_5 : Study of ^<115>In-Nuclear Quadrupole Resonance under Pressure(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn_5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin-lattice relaxation rate 1/T_1 that is dominated by antiferromagnetic (AFM) spin fluctuations (SFs) specific to a quantum critical point (QCP). It is demonstrated that the marked suppression of AFM SFs leads to a reduction in the SC energy gap or in the coupling strength of the Cooper pair. T_c, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long.
- 社団法人日本物理学会の論文
- 2004-08-15
著者
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Settai R.
Nara Medical University Center For Infectious Diseases
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KOBAYASHI Yoshio
Nishina Center for Accelerator Based Science
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SUEMATSU Hisayuki
Extreme Energy-Density Research Institute, Nagaoka University of Technology
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Kawasaki S.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Kitaoka Y.
Graduate School Of Science Osaka University
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Suematsu Hisayuki
Extreme Energy-density Research Institute Nagaoka University Of Technology
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Haga Y.
Advanced Science Research Center, JAEA
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Settai R
Research Institute For Scientific Measurements Tohoku University
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Kubo Y
Fundamental Research Laboratories Nec Corporation
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Kitaoka Y.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Koike Yoshihiro
Advanced Science Research Center Japan Atomic Energy Research Institute
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KAWASAKI Y.
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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ZHENG G.
Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka Univer
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SHISHIDO H.
Department of Physics, Graduate School of Science, Osaka University
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ONUKI Y.
Department of Physics, Graduate School of Science, Osaka University
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YASHIMA M.
Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka Univer
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SETTAI R.
Department of Physics, Graduate School of Science, Osaka University
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Kawasaki Y
Department Of Quantum Materials Science University Of Tokushima
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Yashima M.
Graduate School Of Engineering Science Osaka University
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Kitaoka Y
Osaka Univ. Osaka Jpn
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Zheng G‐q
Department Of Materials Science And Technology Graduate School Of Engineering Science Osaka Universi
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Yashima M.
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University
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Suematsu Hisayuki
Extreme Energy-density Res. Inst. Nagaoka Univ. Of Technol.
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Shishido H
Extreme Energy-density Research Institute Nagaoka University Of Technology
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Onuki Y
Graduate School Of Science Osaka Univ.
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Kishimoto Y
Department Of Physics Faculty Of Engineering Tokushima University
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Haga Y.
Advanced Science Research Center Jaea
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Onuki Y.
Advanced Science Research Center Jaea:graduate School Of Science Osaka Univ.
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Kawasaki S
Department Of Materials Science And Technology Graduate School Of Engineering Science Osaka Universi
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Kitaoka Y.
Department Of Material Physics Osaka University Toyonaka-shi Osaka 560 Japan
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Haga Y
Kyoto University Of Education
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Shishido H.
Department of Physics and Electronics, Osaka Prefecture University:Institute for Nanofabrication Research, Osaka Prefecture University
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Shishido H.
Department of Physics and Electronics, Osaka Pref. Univ.
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