Competing phases in a model of Pr-based cobaltites

Abstract

Motivated by the physics of Pr-based cobaltites, we study the effect of the external magnetic field in the hole-doped two-band Hubbard model close to instabilities toward the excitonic condensation and ferromagnetic ordering. Using the dynamical mean-field theory we observe a field-driven suppression of the excitonic condensate. The onset of a magnetically ordered phase at the fixed chemical potential is accompanied by a sizable change of the electron density. This leads us to predict that Pr${}^{3+}$ abundance increases on the high-field side of the transition.

arXiv comment5 pages, 5 figures, final version

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• Theoretical investigation of excitonic magnetism in LaSrCoO${}_4$
• Spin texture and spin current in excitonic phases of the two-band Hubbard model
• Suppression and revival of long-range ferromagnetic order in the multiorbital Fermi-Hubbard model
• Strong enhancement of magnetic susceptibility induced by spin-nematic fluctuations in an excitonic insulating system with spin-orbit coupling