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J. Phys. Soc. Jpn. 73 (2004) pp. 2073-2076  |Next Article|  |Table of Contents|
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Magnetic Criticality and Unconventional Superconductivity in CeCoIn5: Study of 115In-Nuclear Quadrupole Resonance under Pressure

M. Yashima, S. Kawasaki, Y. Kawasaki, G.-q. Zheng, Y. Kitaoka, H. Shishido1, R. Settai1, Y. Haga2 and Y. Ōnuki1,2

Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
1Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
2Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195

(Received April 13, 2004)

We report the systematic evolution of the superconducting (SC) characteristics of the heavy-fermion (HF) superconductor CeCoIn5 via nuclear-quadrupole-resonance (NQR) measurement under pressure (P). The application of P significantly suppresses the nuclear spin–lattice relaxation rate 1/T1 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. Tc, nevertheless, increases with increasing P due to the increase in HF bandwidth. This is expected to make the lifetime of quasi-particles sufficiently long. ©2004 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/73/2073/
DOI: 10.1143/JPSJ.73.2073


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