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We report on a Raman study of In 1- x Ga x P over the whole range of alloy compositions, x. The additional peak, which appeared for x 0. 98 and about which various interpretations have been proposed, is found to be constructed by two unresolved modes. The Raman spectra indicate that this alloy system has a modified two-mode behavior. The spectral half width of a TO mode broadened in the middle of the alloy composition. This is partly due to the strong two-acoustic-phonons scattering process.
Kato et al. (Wed,) studied this question.