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

M. Yashima, Shinji Kawasaki, Y. Kawasaki, Guo-Qing Zheng, Y. Kitaoka, H. Shishido, R. Settai, Y. Haga, Y. Onuki

Research output: Contribution to journalArticle

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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 2004

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nuclear quadrupole resonance
superconductivity
heavy fermion superconductors
elementary excitations
spin-lattice relaxation
nuclear spin
critical point
fermions
retarding
bandwidth
life (durability)

Keywords

  • CeCoIn
  • Heavy fermion
  • NQR
  • Pressure
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Magnetic criticality and unconventional superconductivity in CeCoIn 5 : Study of 115in-nuclear quadrupole resonance under pressure. / Yashima, M.; Kawasaki, Shinji; Kawasaki, Y.; Zheng, Guo-Qing; Kitaoka, Y.; Shishido, H.; Settai, R.; Haga, Y.; Onuki, Y.

In: Journal of the Physical Society of Japan, Vol. 73, No. 8, 08.2004, p. 2073-2076.

Research output: Contribution to journalArticle

Yashima, M. ; Kawasaki, Shinji ; Kawasaki, Y. ; Zheng, Guo-Qing ; Kitaoka, Y. ; Shishido, H. ; Settai, R. ; Haga, Y. ; Onuki, Y. / Magnetic criticality and unconventional superconductivity in CeCoIn 5 : Study of 115in-nuclear quadrupole resonance under pressure. In: Journal of the Physical Society of Japan. 2004 ; Vol. 73, No. 8. pp. 2073-2076.
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