Mean-Field theory is developed for the system of magnetic ions located onthree or four sublattices, described bythe Heisenberg Hamiltonian with all theexchange integrals different. It is shown that for a certain ratio of exchangeparameters, the system with all antiferromagnetic interactions can manifesttwo compensation temperatures. On the other hand, the same theory appliedto the superlattices with three or four planes in the unit indicates that therecan occur two compensation points with all possible choices of interaction signs.PACS: 75.10.Jm,75.50.Ee,75.50.Gg
Compensation Temperatures in Systems with Three and Four Sublattices and Superlattices
Tatjana Tosic
2002-01-01
Abstract
Mean-Field theory is developed for the system of magnetic ions located onthree or four sublattices, described bythe Heisenberg Hamiltonian with all theexchange integrals different. It is shown that for a certain ratio of exchangeparameters, the system with all antiferromagnetic interactions can manifesttwo compensation temperatures. On the other hand, the same theory appliedto the superlattices with three or four planes in the unit indicates that therecan occur two compensation points with all possible choices of interaction signs.PACS: 75.10.Jm,75.50.Ee,75.50.Gg
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