Softening of phonon by filled rare-earth ion motion common to skutterudite with Sb cages

Kazuaki Iwasa, Yoshiaki Mori, Shohei Itobe, Ryosuke Igarashi, Youichi Murakami, Hitoshi Sugawara, Masahumi Kohgi, Hideyuki Sato

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate phonon modes of the rare-earth filled skutterudite compounds CeRu4sb12, CeOs4Sb12, PrRu 4sb12. These materials exhibit similar low-lying motions of filled ions inside the Sb cages that softens with decreasing temperature. Potentials at the rare-earth sites are considerably anharmonic. Despite that this behavior appears in all the four materials, magnitude of the softening of PrOs4Sb12 is largest among them. This fact implies that difference of carrier state gives rise to renormalization effect on the rare-earth-ion vibrations.

Original languageEnglish
Article numberSA032
Journaljournal of the physical society of japan
Volume80
Issue numberSUPPL. A
DOIs
Publication statusPublished - 2011 Jul

Keywords

  • Anharmonicity
  • Cage structure
  • Neutron scattering
  • Phonon

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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