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Two‐Mode Approximation in the Low‐Temperature Region. Biquadratic Exchange and Single‐Ion Anisotropy
Author(s) -
Kazakov A. A.,
Kleshchev S. M.
Publication year - 1988
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.2221450129
Subject(s) - magnon , anisotropy , excitation , condensed matter physics , magnetization , spin wave , ion , physics , anisotropy energy , heisenberg model , character (mathematics) , mode (computer interface) , magnetic anisotropy , ferromagnetism , quantum mechanics , magnetic field , mathematics , geometry , computer science , operating system
For the case of strong biquadratic‐law exchange and large energy of single‐ion anisotropy taken into account in the Heisenberg model, it is shown that the low‐temperature thermodynamics is not always reduced to the spin‐wave approximation. The hybrid character of the magnon excitation energy along with the excitation branches stipulates a more intensive temperature dependence of magnetization.