Evidence of multiband superconductivity in the $\beta$-phase Mo$_{1-x}$Re$_x$ alloys

TL;DR

This study provides evidence for multiband superconductivity in beta-phase Mo-Re alloys through magnetization, heat capacity, and electronic structure measurements, revealing deviations from single-gap models.

Contribution

It demonstrates the existence of two superconducting gaps in Mo-Re alloys, supported by experimental data and electronic structure calculations, advancing understanding of their superconducting behavior.

Findings

Deviation from WHH theory in Hc2(T)

Superfluid density cannot be explained by single-gap models

Heat capacity shows anomalous temperature dependence

Abstract

We present a detailed study of the superconducting properties in the beta-phase Mo$_{1-x}$Re$_x$ (x = 0.25 and 0.4) solid solution alloys pursued through magnetization and heat capacity measurements. The temperature dependence of the upper critical field H$_{C2}$(T) in these binary alloys shows a deviation from the prediction of the Werthamer-Helfand-Hohenberg (WHH) theory. The temperature dependence of superfluid density estimated from the variation of lower critical field H$_{C1}$ with temperature, cannot be explained within the framework of a single superconducting energy gap. The heat capacity also shows an anomalous feature in its temperature dependence. All these results can be reasonably explained by considering the existence of two superconducting energy gaps in these Mo$_{1-x}$Re$_x$ alloys. Initial results of electronic structure calculations and resonant photoelectron spectroscopy measurements support this possibility and suggest that the Re-5d like states at the Fermi level may not intermix with the Mo-5p and 5s like states in the beta-phase Mo$_{1-x}$Re$_x$ alloys and contribute quite distinctly to the superconductivity of these alloys.