At both the cubic-rhombohedral phase-transition temperature Tc and the zero-gap temperature Tb, anomalous increases in Raman intensities are observed in Pb_1-xSnₓTe (for x=0-1) single crystals. These are attributed to Raman scattering enhanced by the softening of the TO phonon near Tc and also allowed by enhanced interband-mixing effects near Tb. These interband-mixing effects not only enhance the Raman intensity, but also increase Tc.
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Shimada et al. (1977) studied this question.
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