Heat Capacity of Sodium and Potassium at Temperatures below 1°K

Abstract

The heat capacities of sodium and potassium have been measured from about 0.15\ifmmode^\circ\else\textdegree\fi{}K to just above 1\ifmmode^\circ\else\textdegree\fi{}K. No anomaly was observed in either case: the heat capacity could be represented by the sum of a term linear in temperature and a cubic term. Values of the Debye temperatures and effective masses of the conduction electrons are given.