Flow equation approach to the linear response theory of superconductors

Abstract

We apply the flow equation method for studying the current-current response function of electron systems with the pairing instability. To illustrate the specific scheme in which the flow equation procedure determines the two-particle Green's functions we reproduce the standard response kernel of the BCS superconductor. We next generalize this non-perturbative treatment considering the pairing field fluctuations. Our study indicates that the residual diamagnetic behavior detected above the transition temperature in the cuprate superconductors can originate from the noncondensed preformed pairs.

12 pages, 4 figures

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Cited by in corpus (3)

• On the Boson-Fermion resonant model on a lattice
• Linear response within the projection-based renormalization method: Many-body corrections beyond the random phase approximation
• Fluctuation conductivity due to the preformed local pairs