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Role of Internal Stresses in Electronic Pairing of Layered Superconductors
Author(s) -
Górski G.,
Mizia J.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199910)215:2<1083::aid-pssb1083>3.0.co;2-3
Subject(s) - pairing , superconductivity , condensed matter physics , physics , materials science
We consider an extended electronic model for superconducting ceramics. The driving force for superconductivity in a single band model is the nondiagonal Coulomb interaction (correlated hopping), Δ t = ( ii | 1/ r | ji ). This driving force is supplemented by the quantum expression describing the internal local deformation of the Cu–O layers. The BCS equation is solved numerically for a single band model. It is shown that a physically reasonable set of hole‐deformation coupling constants will lower significantly the band expansion coefficient, K = 8 Δ t , required for superconductivity.