This title appears in the Scientific Report : 2015 

Quenching rattling modes in skutterudites with pressure
Sergueev, I. (Corresponding Author)
Glazyrin, K. / Kantor, I. / McGuire, M. A. / Chumakov, A. I. / Klobes, B. / Sales, B. C. / Hermann, Raphael
Streumethoden; JCNS-2
JARA-FIT; JARA-FIT
Streumethoden; PGI-4
Physical review / B, 91 (2015) 22, S. 224304
College Park, Md. APS 2015
10.1103/PhysRevB.91.224304
Journal Article
Jülich Centre for Neutron Research (JCNS)
Materials and Processes for Energy and Transport Technologies
Hybrid and Functionalised Structures
Controlling Collective States
OpenAccess
OpenAccess
Please use the identifier: http://hdl.handle.net/2128/8877 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevB.91.224304 in citations.
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.