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Title

Influence of isotopic substitution on the anharmonicity of the interlayer shear mode of h -BN

AuthorsCuscó, Ramón CSIC ORCID ; Edgar, J. H.; Liu, Song; Cassabois, Guillaume; Gil, Bernard; Artús, Lluís CSIC ORCID
KeywordsBoron nitride
Isotopes
Phonon scattering
Phonons
Shear flow
Issue DateFeb-2019
PublisherAmerican Physical Society
CitationPhysical Review B, 99(8): Article number 085428 (2019)
AbstractWe present a detailed analysis of the temperature dependence of the interlayer shear mode that reveals a variation of the four-phonon scattering coupling with isotopic mass. Phonon anharmonic decay and isotopic disorder effects are very weak for the low-energy interlayer shear mode, and the overall temperature dependence is mainly governed by the thermal lattice expansion. This allows us to observe systematic differences in the temperature dependence of the low-energy mode with the isotopic mass that are related to the four-phonon scattering contribution in quartic anharmonicity. The change in the quartic anharmonicity coefficient between the isotopically pure samples is larger than would be purely expected from the mass variation. © 2019 American Physical Society.
Publisher version (URL)https://doi.org/10.1103/PhysRevB.99.085428
URIhttp://hdl.handle.net/10261/177477
DOI10.1103/PhysRevB.99.085428
ISSN2469-9950
E-ISSN2469-9969
Appears in Collections:(Geo3Bcn) Artículos

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