Abstract
The transformation of the band structure of LaCoO3 in the applied magnetic field has been theoretically studied. If the field is below its critical value BC ≈ 65 T, the dielectric band gap decreases with the field, thus giving rise to negative magnetoresistance that is highest at T ≃ 300–500 K. The critical field is related to the crossover between the low- and high-spin terms of Co3+ ions. The spin crossover results in an insulator-metal transition induced by an increase in the magnetic field.
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