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MA: Fachverband Magnetismus

MA 54: Spin: Transport, Orbitronics and Hall Effects II

MA 54.4: Vortrag

Donnerstag, 19. März 2020, 15:45–16:00, HSZ 403

Conductivity and Hall effect in a ferromagnetic kagome metal Fe₃Sn₂ — •Lilian Prodan^1,2, Vladimir Tsurkan^1,2, and István Kézsmárki¹ — ¹EP V, EKM, University of Augsburg, D-86135 Augsburg, Germany — ²Institute of Applied Physics, MD-2028 Chisinau, Moldova

Metallic ferromagnet Fe₃Sn₂ with a rhombohedral R-3m structure and a kagome lattice of Fe ions is promising to host massive Dirac fermionic states and topological magnon bands. We report the preparation, as well as magnetization, magnetoresistance and Hall effect measurements on Fe₃Sn₂ single crystals. The longitudinal resistivity ρ_xx shows a metallic behavior with a residual resistivity ratio ρ_{300 K}/ρ_{2 K} varying between 15 and 30, depending on the quality of samples. Both longitudinal and transverse magnetoresistance (MR) for magnetic fields H perpendicular to the c-axis are negative in the temperature range 305-50 K and become positive below 50 K. The transverse MR for H parallel to the c-axis is significantly higher than for the in-plane configuration and reaches 14% at 10 K in 9 T. The Hall effect measurements revealed a significant anomalous contribution at 300 K which decreases with decreasing of temperature. A quadratic dependence of the anomalous Hall resistivity on longitudinal resistivity was observed. The experimental data were analyzed with particular attention to intrinsic and extrinsic contributions to anomalous Hall conductivity related to Berry-phase and extrinsic mechanisms, respectively.