Condensation energy in the spin-fermion model for cuprates

Details Condensation energy in the spin-fermion model for cuprates Condensation energy in the spin-fermion model for cuprates

1999-09-27

arxiv.org/abs/cond-mat/9909385v1

PHYS. REV. B, v62, pR787 (2000)

Physics

Condensed Matter

Superconductivity

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.62.R787

We use the Scalapino-White relation between the condensation energy and the difference between the dynamical structure factor in the normal and the superconducting states to compute the condensation energy in the spin-fermion model. We show that at strong coupling, the extra low-frequency spectral weight associated with the resonance peak in the dynamical structure factor in a superconductor is compensated only at energies $\sim J$ which are much larger than the superconducting gap $\Delta$. We argue that in this situation, the condensation energy is large and well accounts for the data for cuprates.

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