The ground-state spin structures of hexagonal antiferromagnets such as CsCuCl 3 in a strong magnetic field are studied by mapping the problem onto an equivalent Bose-gas problem. The spin system close to the saturation is transformed to a low-density Bose gas which has two minima in the single-particle energy band. The low-density expansion is applied to the Bose system and the ground-state spin structure just below saturation field is determined.
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Nikuni et al. (1995) studied this question.
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