Abstract
At both the cubic-rhombohedral phase-transition temperature ${T}_{c}$ and the zero-gap temperature ${T}_{b}$, anomalous increases in Raman intensities are observed in ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Sn}}_{x}\mathrm{Te}$ (for $x=0\ensuremath{-}1$) single crystals. These are attributed to Raman scattering enhanced by the softening of the TO phonon near ${T}_{c}$ and also allowed by enhanced interband-mixing effects near ${T}_{b}$. These interband-mixing effects not only enhance the Raman intensity, but also increase ${T}_{c}$.
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