Forming a dielectric exciton phase in strongly correlated systems with spin crossover

Formation of the magnetic structure and exciton condensate of local magnetic excitons in strongly correlated systems near the spin crossover under high pressure is considered in terms of the effective Hamiltonian obtained from a two-band Hubbard model in the regime of strong electron correlations. The coexistence of the long-range antiferromagnetic order and exciton condensate and the occurrence of the magnetization caused by the condensation of local magnetic excitons are demonstrated. Transformation of the electronic structure of the antiferromagnetic high-spin insulator into the paramagnetic two-band correlated metal via a narrow-gap antiferromagnetic excitonic semiconductor is obtained.

Automated summary

The magnetic structure and exciton condensate formation of local magnetic excitons in strongly correlated systems near the spin crossover under high pressure were considered using an effective Hamiltonian obtained from a two-band Hubbard model. The coexistence of long-range antiferromagnetic order and exciton condensate, as well as the magnetization caused by the condensation of local magnetic excitons, were demonstrated. The transformation of the electronic structure from the antiferromagnetic high-spin insulator to the paramagnetic two-band correlated metal through a narrow-gap antiferromagnetic excitonic semiconductor was obtained.