Evolution of Local Magnetic State in SmRu₄P₁₂ Probed by Muon Spin Relaxation

Abstract

We performed muon spin relaxation measurements on randomly aligned single-crystalline samples of SmRu 4 P 12 down to 0.02 K to investigate static and dynamical magnetic properties in low fields. The local field at the muon site develops gradually with decreasing temperature below a metal–insulator transition temperature of T MI =16.5 K, growing steeply below T ′ =3 K with an accompanying suppression of magnetic fluctuations. We discuss the contribution of a possible octupole moment to the local magnetic states and the magnetic anomaly at T ′ .