Abstract
Magnetic susceptibility and muon spin relaxation (µSR) measurements in the intermetallic cubic compound SmIn 3 with a Γ 8 crystalline-electric-field ground state are reported. Anomalies corresponding to successive phase transitions were observed in the magnetic susceptibility at T I ∼16.5 K, T II ∼15.1 K, and T III ∼14.7 K. A spontaneous local magnetic field was detected below T I using the µSR technique in zero applied field in contrast to the pure quadrupolar ordering scenario proposed in the phase between T I and T II . This result clearly indicates that the primary order parameters in all the ordered phases are magnetic. The local field distribution changes at around T II from a continuous broad one to a sharp one with decreasing temperature, suggesting that an incommensurate-to-commensurate magnetic phase transition takes place at this temperature. A possible magnetic structure in the ground state and the importance of multipolar interactions in the Γ 8 subspace are discussed.
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