Quenching rattling modes in skutterudites with pressure

[en] 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. © 2015 American Physical Society.

Disciplines :

Chemistry

Author, co-author :

Sergueev, I.; Deutsches Elektronen-Synchrotron, Hamburg, Germany

Glazyrin, K.; Deutsches Elektronen-Synchrotron, Hamburg, Germany

Kantor, I.; European Synchrotron Radiation Facility (ESRF), P.O. Box 220, Grenoble, France

McGuire, M. A.; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States

Chumakov, A. I.; European Synchrotron Radiation Facility (ESRF), P.O. Box 220, Grenoble, France

Klobes, B.; Jülich Center for Neutron Science JCNS, Peter Grünberg Institut PGI, Forschungszentrum Jülich GmbH, Jülich, Germany

Sales, B. C.; Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, United States

Hermann, Raphaël ; Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)

Language :

English

Title :

Quenching rattling modes in skutterudites with pressure

Publication date :

2015

Journal title :

Physical Review. B, Condensed Matter and Materials Physics

ISSN :

1098-0121

eISSN :

1550-235X

Publisher :

American Physical Society

Volume :

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Name of the research project :

DFG priority program SPP1386 “Nanostructured Thermoelectrics”; Helmholtz Association Grant No. VH NG-407

Funders :

DOE - United States. Department of Energy [US-OR]
DFG - Deutsche Forschungsgemeinschaft [DE]

Available on ORBi :

since 14 November 2020

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