Abstract
AbstractThe quantum spectrum of elementary excitations of easy‐plane ferromagnet with S = 3/2 in a magnetic field is calculated by the diagram technique for Hubbard operators. It is established that the collective excitation spectrum in the low‐temperature region consists of one longitudinal and two transverse branches. The limiting cases of strong and weak anisotropy are analysed in detail. In the region of small values of quasimomentum the intervals are determined in whose limits the ω(q) dependence is quadratic and linear in quasimomentum modulus.
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