Superconductivity in a two dimensional extended Hubbard model

The Roth’s two-pole approximation has been used by the present authors to investigate the role of d-p hybridization in the superconducting properties of an extended d-p Hubbard model. Superconductivity with singlet <InlineEquation ID="Equ1"> <EquationSource Format="TEX">$d_{x^2-y^2}$</EquationSource> </InlineEquation>-wave pairing is treated by following Beenen and Edwards formalism. In this work, the Coulomb interaction, the temperature and the superconductivity have been considered in the calculation of some relevant correlation functions present in the Roth’s band shift. The behavior of the order parameter associated with temperature, hybridization, Coulomb interaction and the Roth’s band shift effects on superconductivity are studied. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005