With a resolution of ${10}^{-10\mathrm{}}$ J/°K the fluctuation heat capacity has been observed near $T_c$ in thin films of ${\mathrm{Bi}}_{0.4}$${\mathrm{Sb}}_{0.6}$. No indication of peaking was seen in the heat capacity near $T_c$. The heat-capacity transition when compared with the corrected resistivity transition is found to have approximately twice the width. This width is 3 times that predicted by Ferrell.

• Received 20 September 1971

DOI:https://doi.org/10.1103/PhysRevLett.27.1710