Field-induced exciton condensation in LaCoO3

Abstract

Motivated by recent observation of magnetic field induced transition in LaCoO3 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.

5 pages, 5 figures

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• Experimental and computational approaches to study the high temperature thermoelectric properties of novel topological semimetal CoSi
• Competing phases in a model of Pr-based cobaltites
• Pressure effect on magnetic susceptibility of LaCoO${}_3$
• Theoretical investigation of excitonic magnetism in LaSrCoO${}_4$
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• Ferromagnetism of LaCoO${}_3$ films
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• 100 MHz high-speed strain monitor using fiber Bragg grating and optical filter applied for magnetostriction measurements of cobaltite at magnetic fields beyond 100 T
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• Strong enhancement of magnetic susceptibility induced by spin-nematic fluctuations in an excitonic insulating system with spin-orbit coupling
• Excitonic ordering in strongly correlated spin crossover systems: induced magnetism and excitonic excitation spectrum
• Pressure-induced spin-state ordering in Sr${}_2$CoO${}_3$F
• Effects of magnetic fields and orbital angular momentum on excitonic condensation in two-orbital Hubbard model
• Optical signatures of strain-induced ferromagnetism in LaCoO${}_3$ thin film