Softening phonon and relaxation mode in the filled skutterudite PrT 4Sb12(T = Ru and Os)

Kazuaki Iwasa, Yoshiaki Mori, Lijie Hao, Youichi Murakami, Masahumi Kohgi, Hitoshi Sugawara, Hideyuki Sato

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Dynamics of rare-earth ions in filled skutterudite compounds PrT 4Sb12 (T = Ru and Os) has been investigated by a neutron inelastic scattering technique. We found an optical mode located at extremely low energy around 4 meV exhibiting apparent softening behavior by 10 - 30% from 300 to 10 K. This softening mode is attributed to the motion of the filled Pr ions bound in anharmonic potential within the Sb cage. In addition, quasielastic responses near the Brillouin zone center indicate relaxation modes. These features can be explained in terms of a mode coupling scenario involving the motion of the filled Pr ions with huge amplitude.

Original languageEnglish
Article number012122
JournalJournal of Physics: Conference Series
Volume92
Issue number1
DOIs
Publication statusPublished - 2007 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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