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We report 75 As nuclear quadrupole resonance (NQR) measurements of the filled skutterudite superconductors LaRu4As12 and PrRu4As12. The temperature dependence of 75 As-NQR line and the nuclear spin-lattice relaxation rate 1/T1 show that the Pr 3+ has a crystal electric field (CEF) singlet ground state with a separate first excited state. In the superconducting state 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.

D o w n l o a d e d f r o m j o u r n a l s. j p s. j p b y 4 4. 2 2 4. 2 5 0. 2 0 0 o n 0 8 / 2 4 / 2 0

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