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Spectrum of Excitations of an Easy‐Plane Ferromagnet ( S = 3/2) in a Magnetic Field
Author(s) -
Valkov V. V.,
Valkova T. A.,
Ovchinnikov S. G.
Publication year - 1987
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221420126
Subject(s) - condensed matter physics , ferromagnetism , physics , limiting , spectrum (functional analysis) , quasiparticle , anisotropy , excitation , field (mathematics) , plane (geometry) , magnetic field , quadratic equation , quantum mechanics , mathematics , pure mathematics , superconductivity , geometry , mechanical engineering , engineering
The 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.