Carbon-substitution dependent multiple superconducting gap of MgB${}_2$: a "sub-meV" resolution photoemission study

Abstract

``Sub-meV'' resolution photoemission spectroscopy was used to study carbon-substitution dependence on the multiple superconducting gap of Mg(B${}_{1-x}$C${}_x{)}_2$. Two features corresponding to $\sigma$ and $\pi$ gaps are clearly observed in the raw spectra up to carbon concentration x = 7.5 {%}. The observed x dependence of the two gaps shows a qualitatively different behavior: a marked change of the $\sigma$ gap proportional to the $T_c$ variation and a negligible one of the $\pi$ gap. This as well as the temperature dependence can be explained with the two-band mean-field theory. Implications from the present study are discussed.

arXiv comment4 figures, PDF only

References in corpus (20)

• Superconductivity of metallic boron in MgB_2
• Beyond Eliashberg superconductivity in MgB2: anharmonicity, two-phonon scattering, and multiple gaps
• Systematic effects of carbon doping on the superconducting properties of Mg(B${}_{1-x}$C${}_x$)${}_2$
• Carbon-substituted MgB2 single crystals
• Crystal Chemistry of Carbon-Substituted MgB2
• Direct evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy
• Intralayer Carbon Substitution in the MgB2 Superconductor
• Carbon-substitution effect on the electronic properties of MgB${}_2$ single crystals
• Carbon doping of superconducting magnesium diboride
• Electronic and structural properties of superconducting MgB${}_2$, CaSi${}_2$ and related compounds
• Definitive experimental evidence for two-band superconductivity in MgB2
• Electronic structure of MgB${}_2$ from angle-resolved photoemission spectroscopy
• Carbon solubility and superconductivity in MgB2
• Toward one-band superconductivity in MgB2
• The Tc amplification by quantum interference effects in diborides
• Effects of Boron Purity, Mg Stoichiometry and Carbon Substitution on Properties of Polycrystalline MgB${}_2$
• Enhancement of the irreversibility field by carbon substitution in single crystal MgB${}_2$
• Retention of Two-Band Superconductivity in Highly Carbon-Doped MgB2
• Systematic study of the two band/two gap superconductivity in carbon-substituted MgB2 by point-contact spectroscopy
• muSR study of carbon-doped MgB2 superconductors

Cited by in corpus (22)

• Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target
• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Prospects for Improving the Intrinsic and Extrinsic Properties of Magnesium Diboride Superconducting Strands
• 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
• Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron Irradiated MgB2
• Shape resonance for the anisotropic superconducting gaps near a Lifshitz transition: the effect of electron hopping between layers
• Low-Temperature and High-Energy-Resolution Laser Photoemission Spectroscopy
• Superconductivity of magnesium diboride
• Point-contact spectroscopy of Al- and C-doped MgB2. Superconducting energy gaps and scattering studies
• Observation of Topological Surface State in High Temperature Superconductor MgB2
• Isotope effect on the E2g phonon and mesoscopic phase separation near the electronic topological transition in Mg1-xAlxB2
• Electron-phonon coupling and two-band superconductivity of Al- and C-doped MgB2
• Superconducting properties of nanocrystalline MgB${}_2$
• Infrared properties of Mg${}_{1-x}$Al${}_x($B${}_{1-y}$C${}_y$)${}_2$ single crystals in the normal and superconducting state
• Disorder-sensitive superconductivity in the iron silicide Lu${}_2$Fe${}_3$Si${}_5$ studied by the Lu-site substitutions
• Sub-THz electrodynamics of the graphene-like superconductor CaAlSi
• Common Features in Electronic Structure of the Fe-Based Layered Superconductors from Photoemission Spectroscopy
• Theory of vortices in hybridized ballistic/diffusive-band superconductors
• Microscopic properties of vortex state in YB6 probed by muon spin rotation
• Electronic structure of single-crystalline Mg${}_x$Al${}_{1-x}$B${}_2$ probed by x-ray diffraction multipole refinements and polarization-dependent x-ray absorption spectroscopy
• Two-bands superconductivity with intra- and interband pairing for synthetic superlattices