Spin Wave Spectra in Pseudoperovskite Manganites with Superexchange Interaction Competition

In compounds La1/3Ca2/3MnO3 and BiMnO3, a calculation of spin-wave dispersion dependences along pseudoperovskite directions reciprocal space is made. The model includes orbitally dependent superexchange interaction single-ion anisotropy. Considered present competing exchange interactions within magnetic unit cell because orbital or charge-orbital ordering. nearest neighbor taken into account. structure spin waves frequencies are calculated the framework regular multi-sublattice model. peculiarities frustrated spectra found. It shown, that crossing splitting spin-waves branches in non-symmetric points Brillouin zone common feature due to competition. band Г-point for both predicted.