Multiferroic properties of the vortex-antivortex phase of DMI-magnet Ba2CuGe2O7
Ba2CuGe2O7 is an insulator, characterised by a quasi-2D structure with Dzyaloshinskii¿Moriya-interactions (DMI). At low temperature, it shows a wealth of non-trivial spin structures. Besides a cycloidal and an AF cone phase, an AF square and rectangular vortex phase is stabilized in a pocket around 2.2T for fields along the tetragonal c-axis. Recent measurements indicate a finite linewidth in Q and E of the incommensurate peaks in that phase. To investigate the multiferroic properties of Ba2CuGe2O7 in the vortex phase, we want to apply an electric field along the 1,1,0 direction. Theory describes a distortion from the square vortex phase to the rectangular phase. Moreover, an E-field aligned along the c-axis of the crystal should lead to population changes in the degenerate domains with propagation vector along k = (±1, 1, 0) in the cycloidal phase.
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WILD Peter werner; DEMBSKI-VILLALTA Michal; FELLNER Korbinian; MUEHLBAUER Sebastian and RESSOUCHE Eric. (2023). Multiferroic properties of the vortex-antivortex phase of DMI-magnet Ba2CuGe2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-1234
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