Low-Lying Optical Phonon Modes in the Filled Skutterudite CeRu_4Sb_<12>(Condensed matter: structure and mechanical and thermal properties)

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概要

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• The phonon dynamics of filled skutterudite CeRu_4Sb_<12> have been studied at room temperature by inelastic neutron scattering. Optical phonons associated with a large vibration of Ce atoms are observed at a relatively low energy of E〜6meV, and show anticrossing behavior with acoustic phonons. We propose that the origin of the low lattice thermal conductivity in filled skutterudites can be attributed to intensive Umklapp scattering originating from low-lying optical phonons. By an analysis based on a Born-von Karman force model, the longitudinal force constants of the nearest Ce-Sb and Ce-Ru pairs are estimated to be 0.025mdyn/A, while that of the nearest Ru-Sb pair is estimated to be 1.4mdyn/A, indicating that the Ce atoms are bound very weakly to the surrounding rigid RuSb_6-octahedron cages.

• 社団法人日本物理学会の論文
• 2006-12-15

著者

• Lee C.h.

  National Institute Of Advanced Industrial Science And Technology

• HASE I.

  National Institute of Advanced Industrial Science and Technology

• SUGAWARA H.

  Faculty of Integrated Arts and Sciences, The University of Tokushima

• YOSHIZAWA H.

  Institute for Solid State Physics, The University of Tokyo

• SATO H.

  Graduate School of Science, Tokyo Metropolitan University

関連論文

• Low-Lying Optical Phonon Modes in the Filled Skutterudite CeRu_4Sb_(Condensed matter: structure and mechanical and thermal properties)
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