Electronic structure and superconductivity of hcp–bcc binary systems based on titanium and rhenium

The similarity of hcp–bcc binary systems of transition metals of groups IV–V and VI–VII is shown on the basis of a joint analysis of the kinetic, superconducting, and structural properties. Under the assumption that there is a singularity (a pseudo-gap) in the electronic structure of hardened alloys, a model is proposed for the change in the critical temperature of superconductivity with alloy concentration. According to the model, the two peaks in the functions Tc(x) are due to the partial dielectrization of the electron spectrum and do not belong to the equilibrium solid solutions based on the initial metals, as had earlier been assumed.