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VOLUME 40 (1984) | ISSUE 6 | PAGE 236
Phase diagram of the two-dimensional antiferromagnetic XY model in an external magnetic field
The phase diagram of two-dimensional (2D) planar antiferromagnets (AFXY model) in an external magnetic field contains in addition to the Berezinskii-Kosterlitz-Thouless (BKT) transition lines the Ising type transition lines which are associated with the existence of discrete symmetry.