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Incommensurate-to-commensurate magnetic phase transition in SmIn$$_3$$ observed by muon spin relaxation

Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Luetkens, H.*; Sugai, Takashi; Haga, Yoshinori; Suzuki, Hiroyuki*

Magnetic susceptibility $$chi$$ and muon spin relaxation ($$mu$$SR) measurements are reported on SmIn$$_3$$ with a $$Gamma_8$$ ground state. Anomalies corresponding to successive phase transitions were observed in $$chi$$ at $$T_{rm I}sim$$16.5 K, $$T_{rm II}sim$$15.1 K, and $$T_{rm III}sim$$14.7 K. A spontaneous local magnetic field was detected below $$T_{rm I}$$ using the $$mu$$SR technique on the contrary to a pure quadrupolar ordering scenario proposed in the phase between $$T_{rm I}$$ and $$T_{rm II}$$. This result clearly indicates that the primary order parameters in all the ordered phases are magnetic. The local field distribution changes at around $$T_{rm II}$$ 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 importance of multipolar interactions are discussed.

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Category:Physics, Multidisciplinary

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