Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session
TT 33.14: Poster
Mittwoch, 28. März 2012, 15:00–19:00, Poster B
Gutzwiller theory of band magnetism in LaOFeAs — •Tobias Schickling1, Florian Gebhard1, Jörg Bünemann2, Lilia Boeri3, Ole K. Andersen3, and Werner Weber4 — 1Fachbereich Physik, Philipps Universität, D-35037 Marburg, Germany — 2Institut für Physik, BTU Cottbus, D-03013 Cottbus, Germany — 3Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany — 4Fakultät Physik, TU Dortmund, D-44221 Dortmund, Germany
For the iron pnictide LaOFeAs we investigate multi-band Hubbard models which are assumed to capture the relevant physics [1, 2]. In our calculations, we employ the Gutzwiller variational theory which is a genuine many particle approach. We will present results both on the paramagnetic and antiferromagnetic phases of our model systems. These results show that a five band-model is not adequate to capture the relevant physics in LaOFeAs [3]. However, our results for the eight band-model which includes the arsenic 4p bands reproduce the experimental data, especially the small magnetic moment, for a broad parameter regime [4].
S. Graser et al., New J. Phys. 11, 025016 (2009).
O. K. Andersen, L. Boeri. Annalen der Physik, 523:8-50 (2011).
T. Schickling et al., PRL, 106:146402 (2011).
T. Schickling et al., arXiv: 1109.0929.