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

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.

arXiv comment15 pages, 8 figures

References in corpus (22)

• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Phenomenological two-gap model for the specific heat of MgB_2
• Upper critical field pecularities of superconducting YNi2B2C and LuNi2B2C
• Heat Conduction in the Vortex State of NbSe_2: Evidence for Multi-Band Superconductivity
• Resonant and crossover phenomena in a multiband superconductor tuning the chemical potential near a band edge
• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Evidence for time-reversal symmetry breaking in superconducting PrPt4Ge12
• Multiband superconductivity with unexpected deficiency of nodal quasiparticles in CeCu2Si2
• Evidence for Two Gaps and Breakdown of the Uemura Plot in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Single Crystals
• High-Field Superconductivity at an Electronic Topological Transition in URhGe
• Multigap superconductivity in sesquicarbides La${}_2$C${}_3$ and Y${}_2$C${}_3$
• Specific heat of Nb_3Sn: The case for a second energy gap
• Pauli-Limited Multiband Superconductivity in KFe2As2
• Superfluid Density and Energy Gap-Function of Superconducting PrPt4Ge12
• Evidence for strong electron-phonon coupling in MgCNi_3
• Reflection of two-gap nature in penetration depth measurements of MgB${}_2$ film
• Comparative analysis of specific heat of YNi2B2C using nodal and two-gap models
• Multi-band Superconductivity in the Chevrel Phases SnMo6S8 and PbMo6S8
• Multiband Superconductivity of Heavy Electrons in TlNi2Se2 single crystal
• Phonon density of states, anharmonicity, electron-phonon coupling and possible multigap superconductivity in the clathrate superconductors Ba8Si46 and Ba24Si100: Why is Tc different in these two compounds?
• Multi-gap superconductivity and Shubnikov-de Haas oscillations in single crystals of the layered boride OsB_2
• Multiband superconductivity in PrPt4Ge12 single crystals

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• Electronic structure of the Mo${}_{1-x}$Re${}_x$ alloys studied through resonant photoemission spectroscopy
• High field paramagnetic Meissner effect in Mo${}_{100-x}$Re${}_x$ alloy superconductors
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• Thermal conductivity of strong coupling V${}_{1-x}$Ti${}_x$ superconductors in the Mott-Ioffe-Regel limit
• Localization of electronic states resulting from electronic topological transitions in the Mo${}_{1-x}$Re${}_x$ alloys: A photoemission study
• Superconductivity with high upper critical field in Ta-Hf Alloys
• Coexisting superconductivity and ferromagnetism in the (V${}_{0.60}$Ti${}_{0.40}$)-Gd alloys
• Enhancing long-range order in disordered two-band s-wave superconductors