Concentration dependence of the superconducting transition temperature inPdHxandPdDx

Abstract
We have verified the existence of an inverse isotope effect between homogeneous bulk PdHx and PdDx. Maximum x values achieved by high-pressure charging were 0,99 and 0.97 for the hydride and deuteride, respectively. Our extrapolated values for the superconducting transition temperatures of PdH and PdD are 8 and 10 K, respectively.