Superconductivity of PdHXin relation to its phase diagram. II. Specific heat measurements and the form of the Tc(X) relaxation

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Abstract
The specific heats of two samples of PdDX (D/Pd=0.85, D/Pd=0.83) have been followed through the region of their superconducting transition temperatures. In support of the indications from the magnetisation measurements reported in paper I of this series, the specific heat measurements show two closely spaced peaks corresponding to two superconducting transition temperatures-one for a transformed phase and one for the original untransformed phase. As was discussed in I, these could be ordered and disordered beta phases according to the phase diagram proposed by Bond and Ross (1982). A discussion is given of the effect of such a transformation on obtaining unambiguous experimental values of Tc(X) for comparison with values derived from theories of superconductivity in PdHX(DX).