Abstract
We carried out 121,123Sb nuclear quadrupole resonance (NQR) measurement on CeOs4Sb12 to investigate an anomaly observed in ReOs4Sb12. The full width of half maximum of the NQR spectrum shows a step-like increase at 115 K with decreasing temperature (T). The nuclear spin-spin relaxation rate 1/T2 also shows a divergence at the same T. These results are considered to be caused by a distribution of the electric field gradient (EFG) and its fluctuation, which might arise from a small deformation of the cage which consists of twelve Sb. It is considered that the anomaly observed in ReOs4Sb12 at T ∼ 120 K is originated from an unique crystal structure of the filled skutterudite.
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