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Elementary excitations in ferrimagnetic and antiquadrupolar biquadratic systems ( S = 3/2)
Author(s) -
Blaszczak E.,
Westwański B.,
Skrobiś K.
Publication year - 1979
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.2220910131
Subject(s) - magnon , ferrimagnetism , spins , condensed matter physics , degenerate energy levels , physics , ferromagnetism , spin (aerodynamics) , phase (matter) , spin wave , quantum mechanics , magnetization , magnetic field , thermodynamics
The diagrammatic methods for the Racah and standard basis operators are applied to the case of two‐sublattice systems with biquadratic interactions and spin S = 3/2. The elementary excitations are calculated in the (1/ z )° approximation ( z is the number of spins interacting with any given spin) in three phases: antiquadrupolar, ferrimagnetic, and ferromagnetic. In the antiquadrupolar phase there are two doubly degenerate branches of magnons. The spectrum of quadrons coincides with that of magnons. Three branches of magnons and two branches of quadrons are obtained in the ferrimagnetic phase. In the ferromagnetic phase there is one branch of magnons and one of quadrons.