Two band/two gap superconductivity in carbon-substituted MgB2 evidenced by point-contact spectroscopy

Abstract

The Andreev reflection measurements of the superconducting energy gap in the carbon-substituted MgB${}_2$ are presented. Despite the strong suppression of the transition temperature by 17 K in comparison with the pure MgB${}_2$, the same reduced value of the small superconducting energy gap with $2\Delta /k{T}_c\approx$ 1.7 has been systematically observed. This indicates that the two band/two gap superconductivity is still preserved here.

arXiv comment3 eps figs

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• Probing multiband superconductivity by point-contact spectroscopy
• Carbon-substitution effect on the electronic properties of MgB${}_2$ single crystals
• Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron Irradiated MgB2
• The different development of the anisotropic upper critical field in MgB2 by aluminum and carbon doping
• Feshbach resonances and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors
• Toward one-band superconductivity in MgB2
• Evidence for Single-gap Superconductivity in Mg(B_{1-x}C_x)_2 Single Crystals with x=0.132 from Point-Contact Spectroscopy
• Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
• Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies
• The Magnetic-field Dependence of the Gaps in a Two-band Superconductor: A Point-contact Study of MgB_2 Single Crystals
• Influence of carbon substitution on the heat transport in single crystalline MgB2
• MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties
• Comment on: "Band Filling and Interband Scattering Effects in MgB2: Carbon versus Aluminium Doping"
• On Heavy Carbon Doping of MgB${}_2$
• Role of interband scattering in neutron irradiated MgB${}_2$ thin films by Scanning Tunneling Spectroscopy measurements
• Theory of vortices in hybridized ballistic/diffusive-band superconductors
• Effects of Neutron Irradiation on Carbon Doped MgB2 Wire Segments
• ${}^{11}$B NMR study of pure and lightly carbon doped MgB${}_2$ superconductors
• Is Delta_{pi}-gap-only superconductivity possible in Mg_{1-x}Al_{x}B_{2} and Mg(B_{1-y}C_{y})_{2} alloys?