https://doi.org/10.1140/epjb/e2005-00209-1
Superconductivity in a two dimensional extended Hubbard model
1
Departamento de Física-UFSM, 97105-900, Santa Maria, RS, Brazil
2
Centro Brasileiro
de Pesquisas Físicas, Rua Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ, Brazil
Corresponding author: a ggarcia@ccne.ufsm.br
Received:
26
October
2004
Revised:
13
April
2005
Published online:
13
July
2005
The Roth's two-pole approximation has been used by the present authors
to investigate the role of 
hybridization in the superconducting
properties of an extended Hubbard model. Superconductivity with
singlet 
-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.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 74.25.Dw – Superconductivity phase diagrams
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
