Masahiro Sato, Toshiya Hikihara, Tsutomu Momoi
We develop a theory for spin nematic ordering at finite temperatures in three-dimensional spatially anisotropic magnets consisting of weakly coupled frustrated spin-1/2 chains. This theory is applied for weakly coupled J_1-J_2 chains with ferromagnetic nearest-neighbor J_1 and antiferromagnetic next-nearest-neighbor J_2 in magnetic fields. Combining the field theory technique with density-matrix renormalization group results, we complete the finite-temperature phase diagram in magnetic fields, which possesses spin bond-nematic and incommensurate spin-density-wave ordered phases. Effects of a four-spin coupling are also studied. The relevance of our result to quasi-one-dimensional edge-shared cuprate magnets such as LiCuVO_4 is discussed.
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http://arxiv.org/abs/1208.2235
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