Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.84: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Emergent non-coplanar magnetism and colossal transverse magnetoresponse in strongly correlated nodal-line half-metal — •Jyotirmoy Sau1,2, Sourav Chakraborty1, and Manoranjan Kumar1 — 1S. N. Bose National Centre for Basic Sciences, Kolkata 700106, India — 2Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
Understanding the interplay of strong correlation and temperature in nodal-line semimetals can unlock new pathways for spin current control. Here, we consider the 3d-5d double-perovskite Ba2CoWO6, which features mirror-symmetry-protected nodal lines, strong Co-site interactions, and spin-orbit coupling at W sites. Our first-principles and exact diagonalization results reveal a half-metallic ground state with high-spin Co and topologically non-trivial bands. Finite spin-orbit coupling gaps out nodal points and induces band inversion. The ensuing non-trivial Berry curvature generates an anomalous Hall response and stabilizes a non-coplanar magnetic order. Our semi-classical Monte Carlo finite-temperature simulation of the five-orbital Hubbard model confirms the non-coplanar magnetic order and uncovers colossal transverse magnetoresponse. We predict the temperature and magnetic field scales for the tunability of the magnetoresponse.
Keywords: Non-coplanar magnetism; Spin-orbit coupling; Magnetic frustration; Magnetoresistance; Anomalous Hall effect