It has been reported that the phase transition in K 2 CuF 4 is essentially caused by the Kosterlitz-Thouless-type transition slightly modified by the three-dimensional interaction. In order to check this, we have performed a neutron critical scattering study over a wide range of temperature and q space. All of the observed critical parameters including κ, ξ and η as well as the crossover in temperature and field scales are consistent with the previous magnetic study.
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Hirakawa et al. (1982) studied this question.
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