Superconducting Characteristics of Filled Skutterudites LaPt<sub>4</sub>Ge<sub>12</sub> and PrPt<sub>4</sub>Ge<sub>12</sub>: <sup>73</sup>Ge-NQR/NMR Studies

DOI Web Site 被引用文献5件 参考文献17件
  • Fumiya Kanetake
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • Hidekazu Mukuda
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • Yoshio Kitaoka
    Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • Ko-ichi Magishi
    Institute of Socio-Arts and Sciences, The University of Tokushima, Tokushima 770-8502, Japan
  • Hitoshi Sugawara
    Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
  • Kohei M. Itoh
    Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
  • Eugene E. Haller
    University of California at Berkeley and Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.

説明

We report on the superconducting characteristics of the filled skutterudites LaPt 4 Ge 12 ( T c =8.3 K) and PrPt 4 Ge 12 ( T c =7.9 K) by 73 Ge-nuclear quadrupole resonance (NQR) at a zero field. In PrPt 4 Ge 12 , the nuclear spin–lattice relaxation rate 73 (1/ T 1 ) has revealed a coherence peak just below T c , indicating that the superconductivity of PrPt 4 Ge 12 is accounted for in terms of the conventional BCS regime. The result was consistently reproduced by not only an isotropic s -wave gap model but also an anisotropic s -wave gap model with a point node. In the conventional superconductor LaPt 4 Ge 12 , the coherence peak in 73 (1/ T 1 ) is markedly suppressed owing to some damping effect of quasiparticles. We note that the T c s of LaPt 4 Ge 12 and PrPt 4 Ge 12 being higher than that of other R Pt 4 Ge 12 may be attributed to the larger density of states, not to some local anharmonic phonon modes derived from the possible rattling of R ions.

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