Chiral spin pairing in helical magnets |
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Authors: | Onoda Shigeki Nagaosa Naoto |
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Affiliation: | CREST, Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan. s.onoda@riken.jp |
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Abstract: | A concept of chiral spin pairing is introduced to describe a vector-chiral liquid-crystal order in frustrated spin systems. It is found that the chiral spin pairing is induced by the coupling to phonons through the Dzyaloshinskii-Moriya interaction and the four-spin exchange interaction of the Coulomb origin under the edge-sharing network of magnetic and ligand ions. This produces two successive second-order phase transitions upon cooling: an O(2) chiral spin nematic, i.e., spin cholesteric, order appears with an either parity, and then the O(2) symmetry is broken to yield a helical magnetic order. Possible candidate materials are also discussed as new multiferroic systems. |
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