Abstract
We report 75 As nuclear quadrupole resonance (NQR) measurements of the filled skutterudite superconductors LaRu 4 As 12 and PrRu 4 As 12 . The temperature dependence of the 75 As-NQR line and the nuclear spin–lattice relaxation rate 1/ T 1 show that Pr 3+ has a crystal electric field (CEF) singlet ground state with a separate first excited state. In the superconducting states of PrRu 4 As 12 and LaRu 4 As 12 , 1/ T 1 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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