Specific heat of superconducting PdH alloys

The low temperature specific heat of a series of superconducting Pd-H alloys ( {H}/{Pd} ∼ 0.83 ₅-0.87 ₅) has been measured; broad yet very pronounced peaks whose widths are a function of hydrogen concentration are observed. An interesting scaling feature and a theoretical fitting of the data are discussed. A few results of some associated electrical resistance measurements are mentioned, and the possible role of Fe impurities in suppressing superconductivity in PdH alloys is considered.