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Role of Internal Stresses and Kinetic Energy Reduction in Layered Superconductors
Author(s) -
Górski G.,
Mizia J.
Publication year - 2002
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 - 10.1002/1521-3951(200209)233:2<212::aid-pssb212>3.0.co;2-9
Subject(s) - superconductivity , kinetic energy , hubbard model , condensed matter physics , coulomb , physics , coupling constant , electron , coupling (piping) , mean field theory , electric potential energy , charge (physics) , interaction model , interaction energy , materials science , energy (signal processing) , quantum mechanics , psychology , pedagogy , molecule , metallurgy
We have considered an extended Hubbard model for the superconducting ceramics. The driving force for superconductivity in the single band model is the nearest‐neighbour interaction augmented by the on‐site and inter‐site volume charge coupling. The transition to superconductivity is also supplemented by the decrease of kinetic energy obtained in the modified mean‐field approximation, which is applied to the inter‐site interactions. The BCS equation is solved numerically for the single band model with on‐site and inter‐site Coulomb interaction, and on‐site and inter‐site volume charge coupling. It is shown, that a physically reasonable set of electron‐deformation coupling constants, together with kinetic energy decrease, will significantly lower the nearest‐neighbour interaction required for the d‐wave superconductivity.