Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.21: Poster
Montag, 11. März 2013, 15:00–19:00, Poster D
Coulomb interaction in Eliashberg theory of superconductivity. — •Arkady Davydov and Antonio Sanna — Max-Planck-Institute of Microstructure Physics, 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)
D.J. Scalapino, Phys. Rev. 148, 263 (1966)
L.N. Oliveira, E.K.U. Gross, Phys. Rev. Lett. 60, 2430 (1988)
M. Lüders, PRB 72, 024545 (2005)