Condensation energy in strongly coupled superconductors

Details Condensation energy in strongly coupled superconductors Condensation energy in strongly coupled superconductors

2002-09-25

arxiv.org/abs/cond-mat/0209600v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, revtex 4, 3 eps figures

Scientific paper

10.1103/PhysRevB.67.140504

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.

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