The principle of residual symmetry of degenerate equilibrium states and the classification of order parameters of single-sublattice spin s = 3/2 magnets
M.Y. Kovalevsky and S.V. Peletminsky
National Science Center Kharkov Institute of Physics and Technology, 1 Akademicheskaya Str., Kharkiv 61108, Ukraine
Received March 3, 2020, published online June 22, 2020
The classification of equilibrium states of single-sublattice magnets with spin s = 3/2 and SU(4) symmetry of the exchange interaction have been given. The work is based on the concept of quasiaverages and the principle of residual symmetry of degenerate equilibrium states. Using transformation properties of magnetic degrees of freedom, a system of equations for the order parameters is obtained and their solutions are found. The equilibrium structure of these degrees of freedom is presented in terms of parameters of residual symmetry generator.
Key words: single-sublattice magnet, order parameter, principle of residual symmetry, exchange interaction.