Keywords
“easy plane” anisotropy
antiferromagnet
non-Heisenberg exchange interaction
temperature
Abstract
In the mean-field approximation, the influence of both temperature and single-ion easy-axis anisotropy on the phase states and excitation spectra of a non-Heisenberg antiferromagnet with S = 1 is studied. The temperature dependences of vector and tensor order parameters are determined both in phases with vector and tensor order parameters. The dependence of excitation spectra on temperature and anisotropy constant has been studied. It is shown that at temperatures other than zero, an additional (non-relaxation) branch of excitations arises. The temperature dependence of the phase diagram has been studied.
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