Electronic origin of magnetic and orbital ordering in insulating LaMnO3
Abstract
We derive a spin-orbital model for insulating LaMnO3 which fulfills the SU(2) symmetry of S=2 spins at Mn3+ ions. It includes the complete eg and t2g superexchange which follows from a realistic Mn2+ multiplet structure in cubic site symmetry, and the Jahn-Teller induced orbital interactions. We show that the magnetic ordering observed in LaMnO3 is stabilized by a purely electronic mechanism due to the eg-superexchange alone, and provide for the first time a quantitative explanation of the observed transition temperature and the anisotropic exchange interactions.
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