Off-center rattling and tunneling in filled skutterudite LaOs 4Sb12

Yuri Yasumoto, Akio Yamaguchi, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Akira Ochiai

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Off-center rattling of La-ion in the filled skutterudite compound LaOs 4Sb12 has been investigated by means of ultrasonic measurements. An elastic constant C11 shows a remarkable frequency dependence in elastic constant and ultrasonic attenuation at around 25 K. This frequency dependent ultrasonic dispersion reveals thermally activated Γ23-type off-center rattling of La-ion. An attempt time τ0 = 5.0×10-11 sec and an activation energy E = 127 K were obtained from the analysis.

Original languageEnglish
Pages (from-to)242-244
Number of pages3
Journaljournal of the physical society of japan
Issue numberSUPPL.A
Publication statusPublished - 2008
Externally publishedYes


  • Elastic constant
  • Filled skutterudite
  • Off-center
  • Rattling
  • Ultrasonic attenuation

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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