Observation of symmetry lowering associated with the metal-insulator transition in SmRu4P12 by 101Ru-NQR

Satoru Masaki, Takeshi Mito, Masayuki Takemura, Shinji Wada, Hisatomo Harima, Daisuke Kikuchi, Hideyuki Sato, Hitoshi Sugawara, Naoya Takeda, Guo Qing Zheng

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31 Citations (Scopus)


We report the results of NQR (nuclear quadrupole resonance) study on SmRu4P12, one of a few candidates for materials showing octupolar ordering. In this study, we firstly succeeded in observing the 101Ru-NQR signal in filled skutterudite compounds RRu 4P12 (R: rare earth). A single 101Ru-NQR signal splits into two resonance lines, having intensity ratio of 3:1, just below the metal-insulator (M-I) transition temperature of 16.5 K. This result gives convincing evidence for symmetry lowering in the ordered state of this compound, namely the cubic Im3 space group for the filled skutterudite compounds is lowered to the trigonal R3. The model of the ordered structure characterized by a wave vector q = (1, 0, 0) satisfactorily explains the observed phenomena in the present study and the M-I transition in this compound.

Original languageEnglish
Article number043714
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - Apr 2007


  • Filled skutterudite
  • Metal-insulator transition
  • Multipolar ordering
  • NQR
  • SmRuP

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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