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TT: Fachverband Tiefe Temperaturen

TT 69: Superconductivity: Fe-based Superconductors - Theory

TT 69.5: Talk

Friday, March 15, 2013, 10:45–11:00, H21

Shedding light on the pairing mechanism in iron-based superconductors — •Christoph Heil, Markus Aichhorn, Heinrich Sormann, Ewald Schachinger, and Wolfgang von der Linden — Institute of Theoretical and Computational Physics, University of Technology Graz, 8010 Graz, Austria

Whether superconductivity in iron-pnictides and -chalcogenides stems from local or itinerant effects is a question still debated on. In order to investigate the influence of Fermi surface nesting on the pairing mechanism, we calculate from first-principles calculations the static and dynamic susceptibility of various iron-based compounds. We show that the susceptibility depends sensitively on doping and pressure application and confront our theoretical results with conclusions drawn from experiments. For instance, our results give evidence that pairing through Fermi-nesting mechanisms alone is not sufficient to explain the evolution of the transition temperature with pressure in FeSe.