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TT: Fachverband Tiefe Temperaturen

TT 40: Superconductivity: Ferropnictides 1

TT 40.12: Talk

Thursday, March 26, 2009, 17:00–17:15, HSZ 03

Correlations in Ferropnictides — •Klaus Koepernik and Helmut Eschrig — IFW Dresden, Germany

The strenght of correlations in the ferropnictide superconductors is still under debate. While arguments for an electron-electron interaction U of 5eV have been made, some experimental results support a U of merely 1eV. Density functional theory in the local spin density approximation (LSDA) seems to describe several aspects of the electronic structure quite reasonably, which would also support a smaller U. However, the unusually large error of the calculated lattice structure remains a puzzle. We discuss the influence of correlations on the electronic structure and the properties of the ferropnictides in the framework of LSDA+U calculations.