Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn<sub>5</sub>: In-NQR and Co-NMR Studies

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  • Kawasaki Yu
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Kawasaki Shinji
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Yashima Mitsuharu
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Mito Takeshi
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Zheng Guo-qing
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Kitaoka Yoshio
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Shishido Hiroaki
    Department of Physics, Graduate School of Science, Osaka University
  • Settai Rikio
    Department of Physics, Graduate School of Science, Osaka University
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Onuki Yoshichika
    Department of Physics, Graduate School of Science, Osaka University Advanced Science Research Center, Japan Atomic Energy Research Institute

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  • Anisotropic Spin Fluctuations in Heavy-Fermion Superconductor CeCoIn5: In-NQR and Co-NMR Studies

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We report In-NQR and Co-NMR experiments of CeCoIn5 that undergoes a superconducting transition with a record high Tc=2.3 K to date among heavy-fermion superconductors. At zero magnetic field, an anomalous temperature (T) dependence of nuclear spin–lattice relaxation rate 1⁄T1 of 115In is explained by the relation 1⁄T1∝T·χQ(T)3⁄4 based on the anisotropic spin-fluctuations model in case of the proximity to an antiferromagnetic (AFM) quantum critical point (QCP). The novel behavior of 1⁄T1∼T1⁄4 over a wide T range of Tc<T<40 K arises because the staggered susceptibility almost follows the Curie law χQ(T)∝1⁄(T+θ) with θ=0.6 K and hence 1⁄T1∝T⁄(T+0.6)3⁄4∼T1⁄4 for θ<T. We highlight that the behavior 1⁄T1∼T1⁄4 is due to the proximity to the anisotropic AFM QCP relevant with its layered structure, and is not associated with the AFM QCP for isotropic 3D systems. We have also found that the AFM spin fluctuations in CeCoIn5 are suppressed by small magnetic field so that θ=0.6 K at H=0 increases to θ=2.5 K at H=1.1 T, reinforcing that CeCoIn5 is closely located at the QCP.

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