Electronic origin of magnetic and orbital ordering in insulating LaMnO3

Article

关键词: TRANSITION-METAL OXIDES;    PHASE-DIAGRAM;    HARTREE-FOCK;    PEROVSKITE;    LA1-XSRXMNO3;    MANGANITES;    SPECTRA;    LATTICE;    LIQUID;    V2O3;   

DOI  :  10.1103/PhysRevB.59.3295

来源: SCIE

【 摘 要 】

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 e(g) and t(2g) 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 e(g) superexchange alone, and provides a unique and quantitatively correct explanation of the observed transition temperature and the anisotropic exchange interactions. [S0163-1829(99)14901-4].

【 授权许可】

Free