Effect of Structural Phase Transitions on the Superconductivity of PdHx(Dx)
We have examined how the order-disorder structural transitions associated with the “50 K anomaly” in palladium hydride (deuteride) affect the superconducting transition temperature. In PdD0.817 and PdHO.837 samples, the long-range ordering of vacancies in the H(D) sublattice leads to a 7–9% reduction in Tc. While no long range ordering occurs in a PdD0.742 sample, the enhancement of short-range order results in a 7.5% increase in Tc. In all cases the changes in Tc are reversible, the transition temperatures reverting to their original values after the samples are again disordered.
KeywordsNeutron Diffraction Structural Phase Transition Superconducting Transition Temperature Resistance Ratio Sample Resistance
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