Law of Corresponding States for fcc and d-hcp La

The specific heats of fcc and d-hcp La have been measured from 1.0-10.0^∘{}K. There is a striking similarity between these two metals, and a law of corresponding states is obeyed for both the superconducting- and normal-state specific heats. An energy-gap parameter determined from both the temperature-dependent electronic specific heat and from the free-energy difference is 3.7kTc, in good agreement with the BCS value. No evidence is found for an f-band contribution to the superconducting characteristics.