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

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