Unconventional Superconductivity in CeCoIn5 Studied by the Specific Heat and Magnetization Measurements.

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  • Ikeda Shugo
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Shishido Hiroaki
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Nakashima Miho
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Settai Rikio
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Aoki Dai
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195
  • Harima Hisatomo
    The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047
  • Aoki Yuji
    Graduate School of Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0309
  • Namiki Takahiro
    Graduate School of Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0309
  • Sato Hideyuki
    Graduate School of Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0309
  • Onuki Yoshichika
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195

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  • Unconventional Superconductivity in CeCoIn<sub>5</sub> Studied by the Specific Heat and Magnetization Measurements

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We measured the low-temperature specific heat in magnetic fields up to 80 kOe, together with the magnetization for the heavy-fermion superconductor CeCoIn5 with the transition temperature Tc = 2.25 K. CeCoIn5 is a strong-coupling superconductor with a large jump in the specific heat Δ C/Cn (Tc) = 4.7. The heavy-fermion state is significantly formed below 1 K, reaching at least 1070 mJ/K2·mol in magnetic fields. This large electronic specific heat coefficient at 0.25 K is, however, reduced with increasing magnetic field, ranging from 1070 mJ/K2·mol at 50 kOe to 820 mJ/K2·mol at 80 kOe. The upper critical field Hc2 at 0 K is estimated to be 116 kOe for H || [100] and 49.5 kOe for H || [001]. The present anisotropy of Hc2 is well explained by the anisotropic effective mass, but the magnitude of Hc2 is reduced strongly by the paramagnetic effect for both field directions.

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