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We report a resonant Raman scattering study of quaternary In1−xGaxAsyP1−y alloys which confirms the four-mode behavior of the alloy. The scattering amplitude shows resonance enhancement at the E1 edge of the alloy which diminishes with increasing value of x, corresponding to increasing compositional disorder. This disorder further manifests itself in broadening and line-shape asymmetry of the stronger LO-phonon lines.

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