Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.4: Poster

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

Field-induced exciton condensation in LaCoO₃ — •Andrii Sotnikov and Jan Kuneš — Institute of Solid State Physics, TU Wien, Austria

Motivated by recent observation of magnetic field induced transition in LaCoO₃ [1] we study the effect of external field in systems close to instabilities towards spin-state ordering and exciton condensation. We show that, while in both cases the transition can be induced by an external field, temperature dependencies of the critical field have opposite slopes [2]. Based on this result we argue that the experimental observations select the exciton condensation scenario. We show that such condensation is possible due to high mobility of the intermediate spin excitations. The estimated width of the corresponding dispersion is large enough to overrule the order of atomic multiplets and to make the intermediate spin excitation propagating with a specific wave vector the lowest excitation of the system.

[1] A. Ikeda et al., Phys. Rev. B 93, 220401 (2016).

[2] A. Sotnikov and J. Kuneš, Sci. Rep 6, 30510 (2016).