Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Superconductivity: (General) Theory 2

TT 99.2: Vortrag

Donnerstag, 19. März 2015, 15:15–15:30, H 2053

Coulomb interaction in Eliashberg theory of Superconductivity — •Arkadiy Davydov, Antonio Sanna, Sangeeta Sharma, John Kay Dewhurst, and Eberhard Gross — Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany

The Eliashberg theory [1] of superconductivity allows to describe materials with strong pairing interaction. In the non magnetic case it leads to a system of coupled integral multidimensional equations. Computational costs are usually reduced by an isotropic limit [2], and by restricting the Coulomb interaction to the use of one single parameter, µ*, often chosen to give the experimental Tc. In this work we present the parameter-free approach in which the screened Coulomb interaction fully accounted within the Random Phase Approximation, entering the Eliashberg’s equations on the same footing as the phononic interaction. We will compare this approach with Density Functional Theory for Superconductors [3, 4] where the corresponding approximation leads to a good agreement with experiments.

[1] G.M. Eliashberg, Sov. Phys. JETP 11, 696 (1960).

[2] D.J. Scalapino, Phys. Rev. 148, 263 (1966).

[3] L.N. Oliveira, E.K.U. Gross, Phys. Rev. Lett. 60, 2430 (1988).

[4] M. Lüders, PRB 72, 024545 (2005).