Possible skyrmion lattice state in the lacunar spinel GaV4S8
Modulated spin patterns, such as helical or cycloidal structures, can arise in magnets with broken inversion symmetry due to Dzyaloshinskii-Moriya interaction. Recently, these low-symmetry materials have been discovered to even host a spin vortex lattice, the so-called skyrmion lattice (SkL), which attracts great interest owing to its potential applications in spintronics. We are studying the novel non-centrosymmetric compound GaV4S8 which has a rich largely unexplored magnetic phase diagram that may host skyrmions. Using magnetic force microscopy we have already observed stripes (helical) and particle-like (SkL) magnetic structures in the different low field phases. In addition, a test SANS experiment on GaV4S8 confirms the existence of the long-wavelength magnetic order in the bulk. Using D33, the goals of this proposal are i) to systematically characterize the magnetic order over the magnetic phase diagram, and ii) to confirm the existence of a SkL in GaV4S8. The latter can be achieved by the detection of higher-order scattering, which necessitates the high-flux of the ILL. The anticipated results can confirm the realization of a new form of SkL in a new class of materials.
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BORDACS Sandor; DEWHURST Charles; KEZSMARKI Istvan; REYNOLDS Nicole; Henrik M. Ronnow and WHITE Jonathan. (2015). Possible skyrmion lattice state in the lacunar spinel GaV4S8. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-42-392
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