| Issue |
Europhys. Lett.
Volume 61, Number 1, January 2003
|
|
|---|---|---|
| Page(s) | 109 - 115 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00256-8 | |
| Published online | 01 January 2003 | |
two-gap superconductivity with intra- and interband couplings
1
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: kolja@fi.tartu.ee
Received:
17
September
2002
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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