Specific Heat of Indium Antimonide between 6 and 100°K

Abstract

The specific heat of InSb was measured over the temperature range Between 6 and 100°K. The Debye characteristic temperature curve shows a minimum at about 13°K in agreement with the prediction of Fray et al. Analysis by the method of Thirring-like expansion gives Θ_∞=250±5°K which is much smaller than the equivalent temperature 283°K of the maximum frequency of lattice vibration (197 cm⁻¹, in wave number unit), compared with the cases of Ge and Si. It is pointed out that the anharmonic effect is relatively large even in low temperature region.