Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: f-Electron Systems

TT 4.3: Vortrag

Montag, 18. März 2024, 10:15–10:30, H 3005

Electronic structure, transport and magnetic properties of ErB₂ — •André Deyerling¹, Christoph Resch¹, Michal Stekiel², Christian Pfleiderer^1,3,4,5, and Marc A. Wilde^1,3 — ¹Physik Department, TUM School of Natural Sciences, Technische Universität München, Germany — ²Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Germany — ³Zentrum für Quantum Engineering (ZQE), Technische Universität München, Germany — ⁴Munich Center for Quantum Science and Technology (MCQST), Technische Universität München, Germany — ⁵Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Germany

ErB₂ is a hexagonal easy plane ferromagnet exhibiting a large field-dependent anomalous Hall effect for magnetic fields along the hard axis. The magnetic excitation spectrum has features reminiscent of strong single-ion anisotropy and magnon-phonon coupling. We present density functional theory calculations of the magnetic anisotropy energies in and out of the hexagonal plane and calculate the Heisenberg exchange coupling constants via the spin spiral method. Further, we report the Berry curvature contribution of the electronic structure to the anomalous Hall effect when rotating the magnetization from the easy-plane to the hard axis.

Keywords: DFT; Magnons; Hall effect; Ferromagnetism; Diboride