Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Topology: Poster
TT 57.5: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
Anomalous Hall Effect in EuSn2As2 Thin Flakes — •Evgenii Maltsev, Louis Veyrat, Joseph Dufouleur, Romain Giraud, Nicolas Perez Rodriguez, and Bernd Büchner — IFW Dresden, Dresden, Germany
EuSn2As2 is an intrinsic antiferromagnetic topological insulator (TI) with a Néel temperature TN = 24 K and an easy-plane anisotropy. Despite the interest in magnetic TIs, no transport measurements of EuSn2As2 nanostructures were reported up until now. Here, we present the first magnetotransport study on exfoliated nanostructures of EuSn2As2 with thicknesses between 60nm to 140nm. In particular, we study the magnetoresistance with respect to magnetic field orientation tilted between out-of-plane and in-plane directions. A small easy-plane magnetic anisotropy is found as previously reported for macrocrystals. Moreover, an anomalous Hall effect (AHE) is observed below TN. The complex AHE shape does not appear directly compatible with a simple easy-plane anisotropy pointing to a potentially more complex magnetism in EuSn2As2 nanostructures.
We thank Kirill Pervakov for the help with crystal growth and Dr. Vladimir Pudalov for mentoring.
Keywords: 2D Materials; Magnetic Topological Insulators; Anomalous Hall Effect; Magneto-transport