Dynamic properties of magnets with spin S = 3/2 and non-Heisenberg isotropic interaction

Abstract

The dynamic properties of a magnet with magnetic ion spin of 3/2 and an isotropic spin interac tion of a general form have been investigated. Only four phase states can be realized in the system under con sideration 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

Effective easy-axis anisotropy of the two-sublattice single-chain magnet with twisted easy planes

“…Recall, that in the case ϕ = 0, these branches are determined by eqn. (3). Note also that for the isotropic magnet, the above-used decoupling of the Green's functions (the Hubbard-I approximation) gives results equivalent to the well-known results that the spin-wave theory obtained, for example, using the Tyablikov approximation [14].…”

“…In recent years, strongly anisotropic single-chain magnets (SCM) have attracted considerable attention in view of their promising use in magnetic memory and spintronics devices [1]. From a fundamental point of view, SCMs are of interest as low-dimensional magnetic materials with developed spin fluctuations [2][3][4]. To date, several tens of single-chain magnets have been synthesized with different properties.…”

SU(3) symmetry in theory of a weakly interacting gas of spin-1 atoms with Bose-Einstein condensate

“…and V λ is given by Eq. (11). Here ε p = p 2 /2m is the kinetic energy of a particle, a † pα and a pα are the bosonic creation and annihilation operators satisfying Eqs.…”

“…Therefore, the interaction given by Eqs. (11), ( 14) is characterized by the corresponding functions U(p) and J(p).…”

“…In recent years, there have been intensive studies of unconventional orderings in magnets with S 1 [7][8][9][10][11][12][13].…”