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VOLUME 31 (1980) | ISSUE 5 | PAGE 301
Phase transition in a planar magnetic material with frustrations
The dependence of the temperature of the Berezinskii transition on the density of antiferromagnetic bonds na/ is obtained for a planar magnetic material (xy~ model). It is shown that this density plays the role of an effective temperature, with the phase transition disappearing above a certain density n*f.