Field Dependence of Electronic Specific Heat in Two-Band Superconductors

Abstract

The vortex structure is studied in light of MgB${}_2$ theoretically based on a two-band superconducting model by means of Bogoliubov-de Gennes framework. The field dependence of the electronic specific heat coefficient $\gamma (H)$ is focused. The exponent $\alpha$ in $\gamma (H)\propto H^{\alpha }$ is shown to become smaller by adjusting the gap ratio of the two gaps on the major and minor bands. The observed extremely small value $\alpha \sim 0.23$ could be explained reasonably well in this two-band model with the gap ratio $\sim 0.3$.

5 pages, 4 figures, to be published in J. Phys. Soc. Jpn

References in corpus (12)

• Superconductivity of metallic boron in MgB_2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Giant anharmonicity and non-linear electron-phonon coupling in MgB${}_2$; A combined first-principles calculations and neutron scattering study
• Two Gap State Density in MgB${}_2$: A True Bulk Property or A Proximity Effect?
• The reduced total isotope effect and its implications on the nature of superconductivity in MgB2
• Direct evidence for a multiple superconducting gap in MgB2 from high-resolution photoemission spectroscopy
• Mixed-State Quasiparticle Spectrum for d-wave Superconductors
• Order parameter of MgB_2: a fully gapped superconductor
• Nature of bonding and electronic structure in MgB2, a boron intercalation superconductor
• Theory of vortex excitation imaging via an NMR relaxation measurement
• Vortex structure in chiral p-wave superconductors
• Site-selective nuclear magnetic relaxation time in a superconducting vortex state

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