Abstract
The relation between the orbital ordering and magnetic structure of the crystal LaMnO3 is investigated. The dependence of the exchange parameters on the angle Φ of the orbital structure is determined. When the isotropic exchange interaction and the single-ion anisotropy, which depends on the angle Φ and the rotational distortions, are introduced into the spin Hamiltonian, a four-sublattice structure (A X, F Y, G Z) is obtained with orientation of the magnetic moments of the sublattices near the long axis of the orthorhombic cell of the crystal in the basal plane of the crystal (A X ≫ G Z, F Y). The effect of a magnetic field on the magnetic structure and the antiferromagnetic resonance spectrum are investigated taking account of the nonequivalent, anisotropic, orbitally-dependent g tensors. The spin-flop and spin-flip transition fields are calculated.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 118, No. 6, 2000, pp. 1411–1420.
Original Russian Text Copyright © 2000 by Gonchar’, Nikiforov, Popov.
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Gonchar’, L.E., Nikiforov, A.E. & Popov, S.E. Antiferromagnetic resonance spectrum in LaMnO3: Interrelation of the orbital structure and the magnetic properties. J. Exp. Theor. Phys. 91, 1221–1229 (2000). https://doi.org/10.1134/1.1342889
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DOI: https://doi.org/10.1134/1.1342889