Temperature dependence of Raman-active phonons and anharmonic interactions in layered hexagonal BN

Ramon Cuscó, Bernard Gil, Guillaume Cassabois, and Luis Artús
Phys. Rev. B 94, 155435 – Published 20 October 2016

Abstract

We present a Raman scattering study of optical phonons in hexagonal BN for temperatures ranging from 80 to 600 K. The experiments were performed on high-quality, single-crystalline hexagonal BN platelets. The observed temperature dependence of the frequencies and linewidths of both Raman active E2g optical phonons is analyzed in the framework of anharmonic decay theory, and possible decay channels are discussed in the light of density-functional theory calculations. With increasing temperature, the E2ghigh mode displays strong anharmonic interactions, with a linewidth increase that indicates an important contribution of four-phonon processes and a marked frequency downshift that can be attributed to a substantial effect of the four-phonon scattering processes (quartic anharmonicity). In contrast, the E2glow mode displays a very narrow linewidth and weak anharmonic interactions, with a frequency downshift that is primarily accounted for by the thermal expansion of the interlayer spacing.

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  • Received 19 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.155435

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ramon Cuscó1, Bernard Gil2, Guillaume Cassabois2, and Luis Artús1

  • 1Institut Jaume Almera (ICTJA–CSIC), Consejo Superior de Investigaciones Científicas, 08028 Barcelona, Spain
  • 2Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier, F-34095, Montpellier, France

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Issue

Vol. 94, Iss. 15 — 15 October 2016

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