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Condensation energy in the spin-fermion model for cuprates

Ar. Abanov·Andrey V. Chubukov
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Abstract

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 $Δ$. We argue that in this situation, the condensation energy is large and well accounts for the data for cuprates.

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Ar. Abanov, Andrey V. Chubukov. 1999-09-27. Condensation energy in the spin-fermion model for cuprates. https://doi.org/10.1103/physrevb.62.r787

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