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00925njm 22002777a 4500 dc Manjón, F. J. author Loa, I. author Syassen, K. author Lin, C.T. author Cardona, M. author Serrano Gutiérrez, Jorge author 2001 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. 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 Effect of Pressure on the Anomalous Raman Spectrum of CuBr