1984 年 53 巻 8 号 p. 2434-2436
An analytical study is made on a two-dimensional classical isotropic Heisenberg antiferromagnet in a uniform magnetic field. This model is expected to show the Kosterlitz-Thouless phase transition due to a XY-like degeneracy of a canted spin-flop ground state. It is shown that the transition temperature approaches zero logarithmically as the field approaches zero.
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