By means of an AC calorimetry technique the heat capacity has been measured in several Sn x Ge 1-x Te crystals with x ranging from 0.62 to 0.91. The anomalous specific heat near the transition temperature can be separated into two parts. One shows a step-like behaviour; the height of the step becomes larger with decreasing x. The other contribution is a logarithmic critical behaviour; its critical region becomes broader with decreasing x as well. These characteristics might be related to a tricritical point. It has been found that in Sn 0.79 Ge 0.21 Te crystals the anomalous specific heat is proportional to the anomalous elastic stiffness.
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Hatta et al. (1977) studied this question.
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