Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs4Sb12 (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, and Hideyuki Sato
Phys. Rev. B 86, 195115 – Published 12 November 2012

Abstract

The atomic dynamics of the guest modes in heavy fermion filled skutterudites ROs4Sb12 were investigated by inelastic x-ray scattering. Comparison of the phonon dispersion relations for the filled skutterudite SmOs4Sb12 with those for the unfilled skutterudite IrSb3 indicates that the guest modes in filled skutterudites are observed as additional modes in the unfilled skutterudites. The dispersion relations for IrSb3 and SmOs4Sb12 agree reasonably well with the results obtained by ab initio calculations for IrSb3 and LaOs4Sb12, respectively. The rare-earth dependence of the inelastic x-ray scattering spectrum in the series of ROs4Sb12 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 ROs4Sb12 compounds and the electron-phonon coupling between the guest modes with 4f-electrons and conduction electrons in the series of ROs4Sb12 compounds.

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  • Received 28 June 2012

DOI:https://doi.org/10.1103/PhysRevB.86.195115

©2012 American Physical Society

Authors & Affiliations

Satoshi Tsutsui1, Hiroshi Uchiyama1, John P. Sutter1,2, Alfred Q. R. Baron1,3, Masaichiro Mizumaki1, Naomi Kawamura1, Tomoya Uruga1, Hitoshi Sugawara4, Jun-ichi Yamaura5, Akira Ochiai6, Takumi Hasegawa7, Norio Ogita7, Masayuki Udagawa7, and Hideyuki Sato8

  • 1Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
  • 2Diamond Light Source, Didcot, Oxfordshire OX11 ODE, United Kingdom
  • 3Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan
  • 4Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan
  • 5Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 6Center for Low Temperature Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
  • 7Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8527, Japan
  • 8Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan

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Issue

Vol. 86, Iss. 19 — 15 November 2012

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