Quenching rattling modes in skutterudites with pressure
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- European Synchrotron Radiation Facility (ESRF), Grenoble (France)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
- Forschungszentrum Julich GmbH (Germany). Julich Center for Neutron Science (JCNS) and Peter Grunberg Inst. (PGI)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Forschungszentrum Julich GmbH (Germany). Julich Center for Neutron Science (JCNS) and Peter Grunberg Inst. (PGI); Univ. of Liege, (Belgium). Faculty of Sciences
In this paper, 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. Finally, this result suggests that anharmonic coupling between acoustic and optical phonon modes plays a central role in the reduced thermal conductivity.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); Helmholtz Association of German Research Centres
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1265543
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 22; ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
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