Regensburg 2016 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Focus Session: Skyrmions meet Multiferroicity
DF 9.3: Topical Talk
Mittwoch, 9. März 2016, 10:20–10:50, H25
Neutron scattering study of the cycloidal and Néel-type skyrmion lattice phases of GaV4S8 — •Sándor Bordács1, Jonathan S White2, Nicole Reynolds2,3, Charles D Dewhurst4, Henrik M Rønnow3, Vladimir Tsurkan5, Alois Loidl5, and István Kézsmárki1 — 1Department of Physics, Budapest University of Technology and Economics, Budapest, Hungary — 2Laboratory for Neutron Scattering and Imaging, PSI, Villigen, Switzerland — 3Laboratory for Quantum Magnetism, EPFL, Lausanne, Switzerland — 4Institut Laue-Langevin, Grenoble, France — 5Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany
Recently, it was shown that not just whirlpool-like i.e. Bloch-type skyrmions but also Néel-type skyrmions formed by spin cycloids can exist in nature and the polar crystal symmetry of the Mott-insulator GaV4S8 can host this new kind of topological magnetic structures [1].
Here, we report the results of polarized small angle neutron scattering (SANS) experiments in the magnetically ordered phases of GaV4S8. We could experimentally demonstrate that the modulated magnetic states of GaV4S8 are formed by spin cycloids, thus, the helicity state of the skyrmions is compatible with the Néel type. Based on SANS experiments we also revealed that the orientation of the cycloidal wave vector is weakly pinned within the rhomboheral plane. Furthermore, the temperature vs. magnetic field phase diagram of GaV4S8 is systematically studied.
[1] I. Kézsmárki, et al., Nature Materials 14, 1116 (2015).