Superconducting pairing mediated by spin-fluctuations from first principles

2014/09/28 by F. Essenberger, A. Sanna, A. Linscheid +4 · 1 citation
Physics and Astronomy · #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.90.214504

13 pages, 3 figures

arxiv created 2014/09/28 · arxiv updated 2015/06/23

Abstract

We present the derivation of an ab-initio and parameter free effective electron-electron interaction that goes beyond the screened RPA and accounts for superconducting pairing driven by spin-fluctuations. The construction is based on many body perturbation theory and relies on the approximation of the exchange-correlation part of the electronic self-energy within time dependent density functional theory. This effective interaction is included in an exchange correlation kernel for superconducting density functional theory, in order to achieve a completely parameter free superconducting gap equation. First results from applying the new functional to a simplified two-band electron gas model are consistent with experiments.

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