Chiral Spin Fluctuations in the Multiferroic Cu2OSeO3
In noncentrosymmetric magnetic materials chiral Dzyaloshinskii-Moriya (DM) interactions can stabilize 2D and 3D modulations with a fixed sense of rotation of the magnetization vector. These chiral skyrmions in form of isolated and bound axisymmetric strings have been observed in real space in a number of metallic cubic helimagnets in a small closed pocket, the so called A phase, in the (H,T) phase diagram. In addition the first order phase transition is preceded by strong chiral fluctuations, possibly a skyrmion liquid state. The recent discovery of similar behaviour in the insulator and mutliferroic Cu2OSeO3 shows that these are general features of chiral helimagnets. A direct proof can only be provided by high resolution Neutron Spin Echo spectroscopy and we propose to investigate the chiral fluctuations of Cu2OSeO3 at IN15.
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WILHELM Heribert; FALUS Peter; LELIEVRE BERNA Eddy; PAPPAS Catherine; PASINI Stefano; QIAN Feng-Jiao and SCHMIDT Marcus. (2013). Chiral Spin Fluctuations in the Multiferroic Cu2OSeO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1305
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