Abstract
The dynamic properties of a magnet with magnetic-ion spin of 3/2 and an isotropic spin interaction of a general form have been investigated. Only four phase states can be realized in the system under consideration at various relationships between the material parameters: the ferro- and antiferromagnetic phases with saturated spin and the states with tensor order parameters, the nematic and antinematic ones. For these phases, the spontaneous symmetry breaking is determined by the octupole order parameter containing the mean values trilinear in spin operator components at a given site. The spectra of elementary excitations have been determined in all phases. Additional branches of excitations arise in all four phase states
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Original Russian Text © O.A. Kosmachev, Yu.A. Fridman, E.G. Galkina, B.A. Ivanov, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 147, No. 2, pp. 320–337.
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Kosmachev, O.A., Fridman, Y.A., Galkina, E.G. et al. Dynamic properties of magnets with spin S = 3/2 and non-Heisenberg isotropic interaction. J. Exp. Theor. Phys. 120, 281–295 (2015). https://doi.org/10.1134/S1063776115010021
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DOI: https://doi.org/10.1134/S1063776115010021