Antiferromagnetic classicalmodel: A mean-field analysis
- 1 March 1984
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 29 (5), 2680-2684
- https://doi.org/10.1103/physrevb.29.2680
Abstract
The antiferromagnetic classical (planar-rotator) model is analyzed under the mean-field approximation. Phase diagrams are obtained and found to be strongly dependent on the underlying lattice geometry. For bipartite lattices, there exists a second-order transition across a unique phase boundary. For tripartite lattices, there exist two phase boundaries, separating an intermediate "nonhelical" phase from a low-temperature "helical" phase and the high-temperature paramagnetic phase. The two phase boundaries merge into a single critical point at finite temperature and zero magnetic field.
Keywords
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