Possible low-energy excitations of multipoles in SmRu4P12 probed by muon spin relaxation

We report on detailed longitudinal field (LF) muon spin relaxation studies in SmRu4P12 in order to characterize magnetic fluctuations in a magnetically ordered state below TMI=16.5K. The magnitude and fluctuation rate of the fluctuating field are derived as functions of temperature from LF dependence of the longitudinal relaxation rate. Possible low-energy excitations of magnetic multipoles are discussed.