Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: Quantum Magnets, Molecular Magnets and Skyrmions
TT 47.13: Talk
Wednesday, April 3, 2019, 18:15–18:30, H23
Tracing domain wall conductivity in the skyrmion-host multiferroic GaV4S8 — •Somnath Ghara, Korbinian Geirhos, Peter Lunkenheimer, Vladimir Tsurkan, and István Kézsmárki — Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, Augsburg, Germany
The lacunar spinel, GaV4S8, has attracted tremendous interests due to the presence of Néel-type magnetic skyrmion and its multiferroic properties. It crystallizes in a non-centrosymmetric cubic structure (F43m) at room temperature and undergoes a ferroelectric transition at 43 K, reducing the crystal symmetry to rhombohedral (R3m). In the rhombohedral state, the crystals usually consist of four types of polar domains, whose populations can be controlled by applying static electric fields while cooling the samples through the rhombohedral transition. To monitor the domain population, we performed pyro- and magnetoelectric polarization, resistivity and magnetization measurements. We found that the single-domain state with high resistance can be realized upon poling, while the resistance in the multi-domain state is several orders of magnitude lower, which imply the presence of highly conductive domain walls.