Superconductivity and hybridization in a two-dimensional extended Hubbard model: Strong coupling regime

In this work we study the effect of hybridization on the superconductivity within an attractive two-band Hubbard model. We describe the interband effects through an one body mixing term, differently from standard approaches. We consider a s-wave superconducting gap and a Hubbard-I approximation to d...

Full description

Saved in:
Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2008-07, Vol.320 (14), p.e490-e492
Main Authors: Caixeiro, E.S., Troper, A.
Format: Article
Language:English
Subjects:
Hybridization
Superconductivity
Two-band
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work we study the effect of hybridization on the superconductivity within an attractive two-band Hubbard model. We describe the interband effects through an one body mixing term, differently from standard approaches. We consider a s-wave superconducting gap and a Hubbard-I approximation to describe the strongly correlated superconducting regime. We use Greens’ function method to obtain the order parameter Δ 0 and the superconducting critical temperature T c for various values of the hybridization strength V and the attractive potential U. The results show that for fixed values of U and V the gap raises for low temperatures and diminishes abruptly as the temperature increases. Also, T c diminishes as V increases, and there exist a critical value V c for which superconductivity is suppressed.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.02.165