Local Density Approximation for Superconductors

Physical Review Letters 83, 2628 (1999)

Local Density Approximation for Superconductors

S. Kurth, M. Marques, M. Lueders, E.K.U. Gross

A universal LDA-type density functional describing the electronic correlations in superconductors is developed from first principles. The functional is constructed from the exchange-correlation free-energy density, f_xc^hom , of a homogeneous electron gas exposed to an external translationally invariant pairing field. The quantity f_xc^hom , which is a function of the density and a functional of the induced order parameter, is calculated by many-body perturbation theory.

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