Влияние Большой Одноионной Анизотропии На Динамические И Статические Свойства Негейзенберговского Ферримагнетика

Abstract

The influence of a large single-ion anisotropy of the “easy plane” type on the phase states and spectra of elementary excitations of a ferrimagnet with sublattices S=1 and σ=1/2 and non-Heisenberg exchange interaction for a sublattice with S=1 is studied. It is shown that for different ratios of the material parameters of the system, only one phase state is possible, characterized by both vector and tensor order parameters (quadrupole-ferrimagnetic). The condition for sublattice spin compensation is determined, as well as the behavior of the spectra of elementary excitations near the spin compensation line. In the vicinity of the spin compensation line, the magnon spectra are "antiferromagnetically similar".