Superconductivity of Tantalum-Rhenium Alloys

Abstract

The new measurement of the specific heat of bcc 5d transition metal alloys of Ta–Re series containing up to 40 atomic % of Re has been made and their superconducting behaviours of the alloys including up to 20 atomic % of Re have been studied. By making use of McMillan’s theoretical treatment, the electron-phonon coupling constant and bare electronic density of states were deduced. The electron-phonon coupling constant, as a function of the number of electrons per atom, bahaves in the same way as the density of states. This result suggests that the coupling constant is proportional to the bare density of states. The present results of the density of states were compared with the theoretical ones which were deduced by Mattheiss for Ta and W.