Abstract
A study is reported on the relation between orbital ordering and the magnetic structure of an LaMnO3 crystal. The dependence of the exchange parameters on the orbital-structure angle Φ has been determined. Inclusion into the spin Hamiltonian of isotropic exchange interaction and single-ion anisotropy, which depends on the angle Φ and rotational distortions, results in a four-sublattice structure (A X , F Y , G Z ), with the sublattice magnetic moments oriented close to the long axis of the orthorhombic cell in the basal plane of the crystal Open image in new window . The effect of the rare-earth-ion size in RMnO3 manganites on the orbital and magnetic structures is considered.
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