Possible Octupole Ordering in Phase 2 of SmRu4P12 Suggested from Elastic Constants

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  • Possible Octupole Ordering in Phase II of SmRu4P12 Suggested from Elastic Constants
  • Possible Octupole Ordering in Phase II of SmRu<sub>4</sub>P<sub>12</sub> Suggested from Elastic Constants

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We have studied the origin of the successive phase transitions in filled skutterudite SmRu4P12 based on the results of elastic constant measurements. The temperature dependence of the elastic constants shows a sharp drop at the metal–insulator (M–I) transition of TMI=16.5 K in a zero field. The successive transition at TN=14 K is indistinct in a low field. The anomaly at TMI disappears with increasing field. A clear softening toward TN appears in the elastic constants in a high magnetic field. This result suggests a breakdown of the time reversal symmetry in the temperature range between TMI and TN. Such a breakdown is considered to be due to the coupling between the dipole moment and the octupole moment, which is allowed only in Th symmetry.

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