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First-Principles Study of Anharmonic Lattice Dynamics in Low Thermal Conductivity AgCrSe2: Evidence for a Large Resonant Four-Phonon Scattering.
- Source :
-
Physical Review Letters . 12/11/2020, Vol. 125 Issue 24, p1-1. 1p. - Publication Year :
- 2020
-
Abstract
- We report a study of the anharmonic lattice dynamics in low lattice thermal conductivity (κl) material AgCrSe2 by many-body perturbation theory. We demonstrate surprisingly giant four-phonon scattering exclusive for the heat-carrying transverse acoustic phonons due to large quartic anharmonicity and nondispersive phonon band structure, which lead to four-phonon Fermi resonance and breaks the classical t-1∼ωmTn relation for phonon-phonon interactions. This strong resonant scattering extends over the Brillouin zone and substantially suppresses the thermal transport, even down to a low temperature of 100 K. The present results provide fundamental insights into the four-phonon resonant dynamics in the low-κl system with flat phonon dispersions, i.e., cuprous halides and skutterudites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00319007
- Volume :
- 125
- Issue :
- 24
- Database :
- Academic Search Index
- Journal :
- Physical Review Letters
- Publication Type :
- Academic Journal
- Accession number :
- 147633981
- Full Text :
- https://doi.org/10.1103/PhysRevLett.125.245901