Magnetic Criticality and Unconventional Superconductivity in CeCoIn5: Study of 115In-Nuclear Quadrupole Resonance under Pressure

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  • Yashima M.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Kawasaki S.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Kawasaki Y.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Zheng G.-q.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Kitaoka Y.
    Department of Materials Science and Technology, Graduate School of Engineering Science, Osaka University
  • Shishido H.
    Department of Physics, Graduate School of Science, Osaka University
  • Settai R.
    Department of Physics, Graduate School of Science, Osaka University
  • Haga Y.
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Onuki Y.
    Department of Physics, Graduate School of Science, Osaka University Advanced Science Research Center, Japan Atomic Energy Research Institute

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  • Magnetic Criticality and Unconventional Superconductivity in CeCoIn<sub>5</sub>: Study of<sup>115</sup>In-Nuclear Quadrupole Resonance under Pressure

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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.

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