Resolving helimagnon excitations in the long-pitch helimagnetic insulator Cu2OSeO3
In the multiferroic Cu2OSeO3 system, the interplay of interatomic exchange and the Dzyaloshinskii-Moriya (DM) interactions leads to the twisting and canting of magnetic moments and, consequently, to the formation of a spin-spiral ground state. An exotic skyrmion-lattice arrangement can be further stabilized by the application of magnetic field. Our recent time-of-flight (TOF) and triple-axis (TAS) neutron spectroscopy experiments revealed a complicated structure of magnetic excitations in Cu2OSeO3, confirming recent theoretical predictions. However, due to the long pitch of the spin spiral in its zero-field ground state, resolving individual helimagnon branches turned out to be impossible with a conventional cold-neutron spectrometer. Therefore, here we propose to employ the new high-resolution backscattering spectrometer IN16B to map out helimagnon excitations around the (111) or (222) wave vector.
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Dmytro Inosov; APPEL Markus; Bernhard Frick; ONYKIIENKO Yevhen; PORTNICHENKO Pavlo and Yuliia Tymoshenko. (2016). Resolving helimagnon excitations in the long-pitch helimagnetic insulator Cu2OSeO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1486
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