Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 100: Correlated Electrons: Other Materials

TT 100.12: Vortrag

Donnerstag, 19. März 2015, 18:00–18:15, H 3005

Electronic and magnetic properties of manganese pnictides — •Manuel Zingl, Simon Erker, and Markus Aichhorn — Institute of Theoretical Physics and Computational Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria

We study the electronic and magnetic properties of the manganese based compounds BaMn₂As₂ and LaOMnAs by combining density functional theory and dynamical mean field theory (DFT + DMFT). These systems crystallize in the same structure as the iron based pnictide superconductors and were experimentally determined to small gap semiconductors with a Néel type antiferromagnetic ground state. With our study we will clarify the importance of electronic correlations on the formation of the insulating gap. Within DMFT we consider a dp-model corresponding to the experimental crystal structure and we investigate the influence of the selected energy window, the double counting correction and the interaction parameters U and J.