Magnetic criticality and unconventional superconductivity in CeCoIn 5: Study of 115in-nuclear quadrupole resonance under pressure

M. Yashima, S. Kawasaki, Y. Kawasaki, G. Q. Zheng, Y. Kitaoka, H. Shishido, R. Settai, Y. Haga, Y. Onuki

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2073-2076
Number of pages4
Journaljournal of the physical society of japan
Volume73
Issue number8
DOIs
Publication statusPublished - Aug 1 2004

Keywords

  • CeCoIn
  • Heavy fermion
  • NQR
  • Pressure
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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