Rattling in clathrate compounds of ROs4Sb12 and R3Pd20Ge6

Yuichi Nemoto, Tatsuya Yanagisawa, Yuri Yasumoto, Haruki Kobayashi, Akio Yamaguchi, Seiji Tsuduku, Terutaka Goto, Naoya Takeda, Akira Ochiai, Hitoshi Sugawara, Hideyuki Sato, Hideaki Kitazawa

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We have performed ultrasonic experiments on clathrate compounds ROs 4Sb12 and R3Pd20Ge6 to explore rattling and tunneling of a guest rattler's motion. We have found frequency dependence of the elastic constants and ultrasonic attenuations, which is called as ultrasonic dispersion, due to thermally activated rattling. At low temperatures, Curie-type elastic softening obeying 1/T with antiferro-type intersite interaction, which corresponds to quantum tunneling, appears and continues even to the lowest 20 mK in LaOs4Sb12 and La3Pd20Ge6. The understanding of the local charge fluctuation, rattling and tunneling, being coupled to conduction electrons in metals is a basic issue in the aspect of electron-phonon interaction in strongly correlated phenomena such as heavy fermion state, superconductivity and multi-channel Kondo screening effect.

Original languageEnglish
Pages (from-to)153-158
Number of pages6
Journaljournal of the physical society of japan
Volume77
Issue numberSUPPL.A
DOIs
Publication statusPublished - 2008 Jan 1

Keywords

  • Clathrate
  • Elastic constant
  • Filled-skutterudite
  • Rattling
  • Ultrasonic dispersion

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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