<SUP>75</SUP>As-NQR Studies of Superconducting Filled Skutterudites PrRu<SUB>4</SUB>As<SUB>12</SUB> and LaRu<SUB>4</SUB>As<SUB>12</SUB>

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  • Shimizu Masahiro
    Department of Physics, Graduate School of Science, Chiba University
  • Amanuma Hideaki
    Department of Physics, Graduate School of Science, Chiba University
  • Hachitani Kenichi
    Department of Physics, Graduate School of Science, Chiba University
  • Fukazawa Hideto
    Department of Physics, Graduate School of Science, Chiba University
  • Kohori Yoh
    Department of Physics, Graduate School of Science, Chiba University
  • Namiki Takahiro
    Department of Electrical and Electronical Engineering, Muroran Institute of Technology
  • Sekine Chihiro
    Department of Electrical and Electronical Engineering, Muroran Institute of Technology
  • Shirotani Ichimin
    Department of Electrical and Electronical Engineering, Muroran Institute of Technology

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  • 75As-NQR studies of superconducting filled skutterudites PrRu4As12 and LaRu4As12

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We report 75As nuclear quadrupole resonance (NQR) measurements of the filled skutterudite superconductors LaRu4As12 and PrRu4As12. The temperature dependence of the 75As-NQR line and the nuclear spin–lattice relaxation rate 1⁄T1 show that Pr3+ has a crystal electric field (CEF) singlet ground state with a separate first excited state. In the superconducting states of PrRu4As12 and LaRu4As12, 1⁄T1 has a coherence peak just below the transition temperature and decreases exponentially at low temperatures. This behavior shows that the s-wave superconductivity occurs in both compounds.

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