Physics – Condensed Matter – Superconductivity
Scientific paper
2002-10-02
Phys. Rev. B 66 054501 (2002)
Physics
Condensed Matter
Superconductivity
10 pages, 9 figs
Scientific paper
10.1103/PhysRevB.66.054501
We consider fermions on a 2D lattice interacting repulsively on the same site and attractively on the nearest neighbor sites. The model is relevant, for instance, to study the competition between antiferromagnetism and superconductivity in a Kondo lattice. We first solve the two-body problem to show that in the dilute and strong coupling limit the s-wave Bose condensed state is always the ground state. We then consider the many-body problem and treat it at mean-field level by solving exactly the usual gap equation. This guarantees that the superconducting wave-function correctly vanishes when the two fermions (with antiparallel spin) sit on the same site. This fact has important consequences on the superconducting state that are somewhat unusual. In particular this implies a radial node-line for the gap function. When a next neighbor hopping t' is present we find that the s-wave state may develop nodes on the Fermi surface.
Nozieres Ph.
Pistolesi Fabio
No associations
LandOfFree
Superconductivity with hard-core repulsion: BCS-Bose crossover and s-/d-wave competition does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Superconductivity with hard-core repulsion: BCS-Bose crossover and s-/d-wave competition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconductivity with hard-core repulsion: BCS-Bose crossover and s-/d-wave competition will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-164938