Volume 61, Number 1, January 2003
|Page(s)||109 - 115|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 January 2003|
two-gap superconductivity with intra- and interband couplings
Institute of Physics, University of Tartu - Riia 142,
51014 Tartu, Estonia
2 Institute of Theoretical Physics, University of Tartu - Tähe 4, 51010 Tartu, Estonia
Corresponding author: email@example.com
Accepted: 18 October 2002
A two-band model of superconductivity is developed. It exploits repulsive σ-π interband coupling besides the σ-intraband electron-phonon attraction and Coulomb interaction. With an adjustable set of parameters the observed dependences of the gaps, specific heat and second critical magnetic field on temperature, furthermore vs. -doping, and the isotope effect exponent are reproduced without further fittings. The unconventional superconductivity can be ascribed to the specific band structure and the role of electron interactions.
PACS: 74.20.-z – Theories and models of superconducting state / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.)
© EDP Sciences, 2003
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