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Abstract
Phase diagram of a planar antiferromagnet on a stacked triangular lattice subject to a uniform orthorhombic distortion is studied within the Landau approach. This spin system with partially released frustration exhibits a variety of ordered phases in magnetic field parallel to the basal plane including elliptically and linearly polarized incommensurate structures. Four magnetically ordered phases coexist at a multicritical point. The theory is applied to explain the experimental phase diagram of ${\mathrm{RbMnBr}}_{3}$ and satisfactory agreement for temperature dependences of critical fields is found. \textcopyright{} 1996 The American Physical Society.
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