Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs 4Sb 12 (R = light rare-earth)

Satoshi Tsutsui, Hiroshi Uchiyama, John P. Sutter, Alfred Q.R. Baron, Masaichiro Mizumaki, Naomi Kawamura, Tomoya Uruga, Hitoshi Sugawara, Jun Ichi Yamaura, Akira Ochiai, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, Hideyuki Sato

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Abstract

The atomic dynamics of the guest modes in heavy fermion filled skutterudites ROs 4Sb 12 were investigated by inelastic x-ray scattering. Comparison of the phonon dispersion relations for the filled skutterudite SmOs 4Sb 12 with those for the unfilled skutterudite IrSb 3 indicates that the guest modes in filled skutterudites are observed as additional modes in the unfilled skutterudites. The dispersion relations for IrSb 3 and SmOs 4Sb 12 agree reasonably well with the results obtained by ab initio calculations for IrSb 3 and LaOs 4Sb 12, respectively. The rare-earth dependence of the inelastic x-ray scattering spectrum in the series of ROs 4Sb 12 compounds is difficult to interpret in terms of changes in the atomic mass and electron number of the rare-earth atom inserted into the Sb cage. The combination of inelastic x-ray scattering and x-ray absorption spectroscopy reveals a correlation between the guest mode energy and the guest free space in these compounds. The rare-earth dependence of the inelastic x-ray scattering spectrum indicates the mediation of heavy fermion behavior by the atomic motion of the guest in some ROs 4Sb 12 compounds and the electron-phonon coupling between the guest modes with 4f-electrons and conduction electrons in the series of ROs 4Sb 12 compounds.

Original languageEnglish
Article number195115
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number19
DOIs
Publication statusPublished - 2012 Nov 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Tsutsui, S., Uchiyama, H., Sutter, J. P., Baron, A. Q. R., Mizumaki, M., Kawamura, N., Uruga, T., Sugawara, H., Yamaura, J. I., Ochiai, A., Hasegawa, T., Ogita, N., Udagawa, M., & Sato, H. (2012). Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs 4Sb 12 (R = light rare-earth). Physical Review B - Condensed Matter and Materials Physics, 86(19), [195115]. https://doi.org/10.1103/PhysRevB.86.195115