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VOLUME 66 (1997) | ISSUE 12 | PAGE 817
Interaction of optical phonons with anisotropic imperfections
Inelastic (Raman) light scattering by phonons interacting with anisotropic imperfections has been investigated. Three different kind of disorder-induced defects (point, linear and planar) have been considered. The optical phonon width and lineshape are found to be essentially dependent on the dimension of the imperfections. There is a close correspondence between the scale of the imperfection and the phonon lineshape observed in the Raman scattering experiments. Dependence of the phonon frequency shift and width on the defect concentrations is calculated and critical concentrations are defined under which the optical phonon cannot be observed anymore. PACS: 63.20.Mt