Generalization of the heisenberg hamiltonian for the case of an atomic system with a variable atomic spin value

Abstract The representation invariant relative to spin rotations of the Hamiltonian of electrostatic electron interactions is derived for a dielectric. The temperature dependence of the exciton spectrum and that of the value of the site spin moment, 〈 S 〉, due to exciton‐magnon interactions are considered.

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