Abstract
The magnetic state of a system of particles with a “large” spin of 3/2 in the presence of isotropic exchange interaction in the system has been studied on the basis of a derived spin Hamiltonian. It has been shown that, at a positive contribution of the exchange interaction, an unstable nematic state appears and transforms to a stable ferromagnetic state (with an average spin of 3/2). The excitation spectrum in the ferromagnetic state is a triply degenerate Goldstone-type gapless magnon mode. At a negative sign of the exchange contribution, an antinematic state is stable with respect to a transition to a ferromagnetic state, which is forbidden. In this case, the antinematic always occurs in the state of a phase transition to an unstable antiferromagnetic state, the excitation spectrum of which is characterized by a single nondegenerate Goldstone mode.
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Original Russian Text © E.V. Orlenko, F.E. Orlenko, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 7, pp. 1338–1346.
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Orlenko, E.V., Orlenko, F.E. Magnetic states of an isotropic magnet with the “large” ion spin S = 3/2. Phys. Solid State 58, 1384–1392 (2016). https://doi.org/10.1134/S1063783416070271
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DOI: https://doi.org/10.1134/S1063783416070271