31P-NMR and µSR Studies of Filled Skutterudite Compound SmRu4P12

Abstract

The 31 P nuclear magnetic resonance ( 31 P-NMR) and muon spin relaxation (µSR) of the filled skutterudite compound SmRu 4 P 12 have been carried out. The line width of the 31 P-NMR spectrum rapidly increases below the metal–insulator transition temperature T MI but not below the Neel temperature T N . The temperature dependence of the spin–lattice relaxation rate shows a successive anomaly at T MI and T N . The µSR measurements indicate that a static internal field appears below T MI , which means that the ordering below T MI is a magnetic ordering with the time reversal symmetry breakdown. These results support a scenario that a magnetic octupolar ordering occurs below T MI in SmRu 4 P 12 .