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oai:uvadoc.uva.es:10324/653622025-02-13T09:44:52Zcom_10324_1158com_10324_931com_10324_894col_10324_1242

Manjón, F. J. Loa, I. Syassen, K. Lin, C.T. Cardona, M. Serrano Gutiérrez, Jorge 2024-01-30T13:59:13Z 2024-01-30T13:59:13Z 2001 phys. stat. sol. (b) 223, 331 (2001) 0370-1972 https://uvadoc.uva.es/handle/10324/65362 10.1002/1521-3951(200101)223:1<331::AID-PSSB331>3.0.CO;2-E 331 1 336 physica status solidi (b) 223 1521-3951 Raman spectra of isotopically pure zinc-blende CuBr (63Cu81Br) were measured at T = 10 K under hydrostatic pressures up to 4 GPa. The ambient-pressure spectrum consists of a transverse-optic (TO) phonon line and an anomalous broad band located at frequencies near the expected first-order longitudinal-optic (LO) scattering. Application of hydrostatic pressure leads to an increase of the linewidth of the TO mode and to a significant change of the LO scattering band which above 3 GPa develops into a single LO phonon peak of narrow linewidth. The disappearance of the LO Raman anomaly as well as the broadening of the TO mode with pressure are explained by pressure-dependent third-order anharmonic interactions of zone-center optical phonons with q = 0 two-phonon states. Max Planck Gesellschaft European Union - Marie Curie IEF application/pdf eng Wiley info:eu-repo/semantics/openAccess Effect of Pressure on the Anomalous Raman Spectrum of CuBr info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion SI