Néel-type skyrmion lattice in tetragonal polar magnet VOSe${}_2$O${}_5$

Abstract

Formation of the triangular skyrmion-lattice is found in a tetragonal polar magnet VOSe${}_2$O${}_5$. By magnetization and small-angle neutron scattering measurements on the single crystals, we identify a cycloidal spin state at zero field and a Néel-type skyrmion-lattice phase under a magnetic field along the polar axis. Adjacent to this phase, another magnetic phase of an incommensurate spin texture is identified at lower temperatures, tentatively assigned to a square skyrmion-lattice phase. These findings exemplify the versatile features of Néel-type skyrmions in bulk materials, and provide a unique occasion to explore the physics of topological spin textures in polar magnets.

11 pages, 4 figures, supplemental material (7 pages)

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