Abstract
A theoretical study is made into the effect of the crystal, orbital, and charge structures on the magnetic structure and spin-wave spectra and on the antiferromagnetic resonance (AFMR) for R0.5Ca0.5MnO3 crystals of monoclinic structure. The model assumes fixed crystal, charge, and orbital structures and enables one to determine the orbitally dependent exchange interaction and single-ion anisotropy for R = La, Pr, Tb. A 16-sublattice weakly noncollinear magnetic CE-structure without a ferromagnetic component is obtained. The behavior of magnetic structure in an external magnetic field is simulated, and the values of fields of spin-flop-transition for different Rs are obtained. The law of spin-wave dispersion and the field dependence of the antiferromagnetic-resonance spectrum 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. 123, No. 3, 2003, pp. 575–589.
Original Russian Text Copyright © 2003 by Gonchar’, Nikiforov.
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Gonchar’, L.É., Nikiforov, A.E. Antiferromagnetic-resonance spectrum in charge-ordered R0.5Ca0.5MnO3 manganites (R=La, Pr, Tb): The effect of orbital and charge structures. J. Exp. Theor. Phys. 96, 510–522 (2003). https://doi.org/10.1134/1.1567425
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DOI: https://doi.org/10.1134/1.1567425