Condensation energy in strongly coupled superconductors
Strongly Correlated Electrons
2009-11-07 v1 Superconductivity
Abstract
We consider the condensation energy in superconductors where the pairing is electronic in origin and is mediated by a collective bosonic mode. We use magnetically-mediated superconductivity as an example, and show that for large spin-fermion couplings, the physics is qualitatively different from the BCS theory as the condensation energy results from the feedback on spin excitations, while the electronic contribution to the condensation energy is positive due to an ``undressing'' feedback on the fermions. The same feedback effect accounts for the gain of the kinetic energy at strong couplings.
Keywords
Cite
@article{arxiv.cond-mat/0209600,
title = {Condensation energy in strongly coupled superconductors},
author = {Robert Haslinger and Andrey V. Chubukov},
journal= {arXiv preprint arXiv:cond-mat/0209600},
year = {2009}
}
Comments
4 pages, revtex 4, 3 eps figures