Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.7: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG4

Excitonic condensation in LaCoO₃ perovskite — •Juan Fernandez Afonso and Jan Kunes — Technische Universität Wien, Freihaus building, Wiedner Hauptstrasse 8 -10, 1040 Wien, AUSTRIA

We study the possibility of excitonic condensation in transition metals perovskites with d⁶ electronic configuration such as LaCoO₃. These excitonic states arise from an intra-atomic e_g − t_2g electron-hole coupling. It is possible to characterise them by a 3×3 complex order parameter. We present several LDA+U self-consistent solutions which correspond to distinct ordered states. We study both stability and symmetry properties of these solutions, investigate the evolution of the order parameter with the interaction strength and the effect that the spin-orbit coupling has on these states. Our results suggest that LaCoO₃ is close to the excitonic instability and suggest ways how the instability can be reached in the reality.