Interactions of Magnons in the Six-Sublattice Antiferromagnet

A microscopic model of the six-sublattice antiferromagnet CsMnF3 is considered. Spectra and three-magnon amplitudes of the electronic and nuclear spin waves are calculated. It is shown that in the multisublattice model there are new processes of the low-frequency spin-wave interactions (parallel with other processes that take place in the two-sublattice model too). Contributions of these processes should be taken into account in the theoretical description of nonlinear properties of CsMnF3. Results obtained are compared with experimental data. [Russian Text Ignored].