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

doi:10.1103/PhysRevB.91.224304

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 journal › Article › peer-review

18 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 language	English
Article number	224304
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	91
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.91.224304
State	Published - Jun 15 2015

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title = "Quenching rattling modes in skutterudites with pressure",

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 Gr{\"u}neisen 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.",

author = "I. Sergueev and K. Glazyrin and I. Kantor and McGuire, {M. A.} and Chumakov, {A. I.} and B. Klobes and Sales, {B. C.} and Hermann, {R. P.}",

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T1 - Quenching rattling modes in skutterudites with pressure

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, R. P.

PY - 2015/6/15

Y1 - 2015/6/15

N2 - 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.

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.

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JO - Physical Review B - Condensed Matter and Materials Physics

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ER -

Quenching rattling modes in skutterudites with pressure

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