Quenching rattling modes in skutterudites with pressure

I. Sergueev, K. Glazyrin, I. Kantor, M. A. McGuire, A. I. Chumakov, B. Klobes, B. C. Sales, R. P. Hermann

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A high-pressure study of the lattice dynamics in the filled skutterudite Eu0.84Fe4Sb12 was carried out by means of x-ray powder diffraction and nuclear inelastic scattering. The anharmonicity of particular phonon modes was characterized by mode and element specific Grüneisen parameters. The large anharmonicity of the rattling optical mode that is hybridized with the acoustical phonons at ambient pressure is reduced at high pressure as the phonon modes decouple. This result suggests that anharmonic coupling between acoustic and optical phonon modes plays a central role in the reduced thermal conductivity.

Original languageEnglish
Article number224304
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number22
DOIs
StatePublished - Jun 15 2015

Funding

FundersFunder number
Helmholtz AssociationVH NG-407
Massachusetts Department of Fish and Game
Oak Ridge National Laboratory
U.S. Department of Energy

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