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VOLUME 50 (1989) | ISSUE 10 | PAGE 416
Orientational transitions in Heisenberg antiferromagnets on triangular lattice
In 2D-isotropic hexagonal Heisenberg antiferromagnets, the spin flip in a magnetic field occurs through an intermediate phase with an unbroken, continuous symmetry and with a constant magnetization equal to 1/3 of the nominal value. In strong fields the noncollinear phase is characterized by a parallel arrangement of the spins of the two sublattices and by a nonvanishing transverse magnetization.