LOW-TEMPERATURE SPECIFIC-HEAT OF LA0.67BA0.33MNO3 AND LA0.8CA0.2MNO3

We report measurements of the specific eat of La0.67Ba0.33MnO3 and La0 .8Ca0.2MnO3 for temperatures 2<T<15 K. These materials are ferromagnet ic metallic oxides which exhibit colossal magnetoresistance. We find t hat above 3 K the specific heat has terms proportional to T and T-3, b ut a T-3/2 term, as might be expected from the excitation of ferromagn etic spin waves, cannot be resolved outside of the precision of the da ta. The cubic term gives Debye temperatures of 400+/-17 K, and the lin ear term gives electron densities of states which are enhanced over ba nd-structure estimates.