Low Temperature Physics: 33, 229 (2007); https://doi.org/10.1063/1.2719960 (5 pages)
Fizika Nizkikh Temperatur: Volume 33, Number 2-3 (February 2007), p. 308-313 ( to contents , go back )
Antiferromagnetic resonance in LaMnO3
A.A. Mozhegorov, L.E. Gonchar’, and A.E. Nikiforov
Ural State University, Lenin ave., 51, Ekaterinburg 620083, Russia
Received September 7, 2006
The external magnetic field and temperature dependences of the magnetic structure and AFMR frequencies in LaMnO3 are studied. The recently developed model involving orbit-dependent superexchange and single-ion anisotropy interactions is used. The temperature dependence is described in the mean-field approximation in good agreement with experiments. Phase diagrams H–T in the main field directions (a,b,c) are constructed. The problem of the origin of Mn3+ spins weak noncollinearity is solved. Also the optimal method of deriving an expression for magnetic free energy is proposed.
PACS: 75.10.Dg Crystal-field theory and spin Hamiltonians;
Key words: manganites, Dzyaloshinsky-Moriya interaction, orbitally-dependent superexchange, magnetic structure.