TY  - JOUR
AU  - Sergueev, I.
AU  - Glazyrin, K.
AU  - Kantor, I.
AU  - McGuire, M. A.
AU  - Chumakov, A. I.
AU  - Klobes, B.
AU  - Sales, B. C.
AU  - Hermann, Raphael
TI  - Quenching rattling modes in skutterudites with pressure
JO  - Physical review / B
VL  - 91
IS  - 22
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2015-04301
SP  - 224304
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000356129600006
DO  - DOI:10.1103/PhysRevB.91.224304
UR  - https://juser.fz-juelich.de/record/202012
ER  -