Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Fe-based Superconductors - 1111, LiFeAs & As-free Pnictides

TT 2.5: Vortrag

Montag, 26. März 2012, 10:30–10:45, H 2053

Effects of correlation in LiFeAs — •Johannes Ferber, Kateryna Foyevtsova, Roser Valenti, and Harald 0. Jeschke — Institut für theoretische Physik, Universität Frankfurt, Germany

We discuss the role of correlations in the iron pnictide LiFeAs by studying the effects on band structure, mass enhancements, and Fermi surfaces in LDA+DMFT. For LiFeAs, seemingly contradictory results from angle-resolved photoemission spectroscopy (ARPES) and de Haas-van Alphen (dHvA) measurements have been reported. Whereas dHvA observes good agreement with LDA results, ARPES reports strongly altered Fermi surfaces, possibly as a result of electronic correlations. In our calculations we find the hole pockets of the Fermi surface to be affected more strongly by correlations. Based on this observation, we give a suggestion for how to reconcile the experimental findings and assess the importance of correlations in this compound.