Specific Heat of Bismuth at Liquid Helium Temperatures

The specific heat of bismuth has been investigated in the liquid helium region down to 1.3°K by means of a new vacuum calorimeter. The Debye $\theta$ is found to increase from 103.5 to 120 in the range 4.1 to 2°K and appears to attain a constant value at lower temperatures. Evidence is obtained for an electronic contribution of $0.114\times {10}^{-4\mathrm{}}T$ calories/°K to the atomic heat of bismuth.