Title: Specific-heat discontinuity in impure two-band superconductors
Authors: Mishonov, TM ×
Penev, ES
Indekeu, Joseph
Pokrovsky, VL #
Issue Date: 2003
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B. Condensed matter and materials physics vol:68 pages:104517-1-104517-8
Abstract: The Ginzburg-Landau coefficients and the jump of the specific heat are calculated for a disordered two-band superconductor. We start with the analysis of a more general case with arbitrary anisotropy. While the specific-heat discontinuity at the critical temperature T-c decreases with increasing disorder, its ratio to the normal-state specific heat at T-c increases and slowly converges to the isotropic value. For strong disorder the deviation from the isotropic value is proportional to the elastic electron-scattering time. In the case of a two-band superconductor we apply a simplified model of the interaction independent of the momentum within a band. In the framework of this model all thermodynamic variables can be found explicitly at any value of the scattering rate. This solution explains the sample dependence of the specific-heat discontinuity in MgB2 and the influence of disorder on the critical temperature.
ISSN: 2469-9950
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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