Nucleation and Stabilisation of low temperature skyrmions in Cu2OSeO3
Studies of cubic chiral magnets reveal a universal magnetic phase diagram, composed of helical spiral, conical spiral as well as a skyrmion lattice phase (SkL), confined in a small pocket of the magnetic field-temperature phase diagram, just below Tc. By combining neutron diffraction with magnetisation measurements we have found a remarkable deviation from this universal behavior. We have observed a new "tilted spiral" conical state in Cu2OSeO3, where the spiral wave vector is tilted away from the magnetic field direction and gives rise to strong diffuse scattering. By investigating the stability region of this novel phase and its co-existence with the metastable conical phase by fast cooling the sample under magnetic field, we saw that we stabilised long-lived SkL correlations over a large fraction of the phase diagram and for all directions of the magnetic field with respect the the main crystallographic axis (<001>, <110> and <111>). We wish to investigate these new phases and their topology, as there are theoretical predictions for the co-existence of tilted skyrmions with the tilted conical phase.
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PAPPAS Catherine; CUBITT Robert; LABH Ankit; LELIEVRE BERNA Eddy; SCHMIDT Marcus and WILHELM Heribert. (2019). Nucleation and Stabilisation of low temperature skyrmions in Cu2OSeO3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-492
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