Journal
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Volume 42, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1751-8113/42/7/075401
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Funding
- Julian Wynnyckyj at Kyiv-Mohyla Academy
- International Charitable Fund for Renaissance of Kyiv-Mohyla Academy
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In this paper we obtain equations for large-scale fluctuations of a mean field (the field of magnetization and quadrupole moments) in a magnetic system realized by a square (cubic) lattice of atoms with spin s >= 1 at each site. We use the generalized Heisenberg Hamiltonian with a biquadratic exchange as a quantum model. A quantum thermodynamical averaging gives classical effective models, which are interpreted as Hamiltonian systems on coadjoint orbits of the Lie group SU(3).
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