Field-induced exciton condensation in LaCoO.sub.3./sub.

0465252 - FZÚ 2017 RIV GB eng J - Journal Article
Sotnikov, A. - Kuneš, Jan
Field-induced exciton condensation in LaCoO₃.
Scientific Reports. Roč. 6, Jul (2016), 1-6, č. článku 30510. ISSN 2045-2322. E-ISSN 2045-2322
EU Projects: European Commission(XE) 646807 - EXMAG
Institutional support: RVO:68378271
Keywords : exciton condensation * LaCoO₃ * dynamical mean-field theory
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 4.259, year: 2016

Motivated by recent observation of magnetic field induced transition in LaCoO 3 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. 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.
Permanent Link: http://hdl.handle.net/11104/0264051