Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 40: Transport in Materials: Diffusion, Charge, or Heat Conduction IV
MM 40.3: Talk
Friday, March 13, 2026, 10:45–11:00, SCH/A216
Anisotropic anomalous Hall effect in distorted kagome GdTi3Bi4 — •Avdhesh Kumar Sharma1, Bo Tai1, Subhajit Roychowdhury2, Premakumar Yanda1, Ulrich Burkhardt1, Xiaolong Feng1, Claudia Felser1, and Chandra Shekhar1 — 1Max Plank Institute for chemical physics of solids, Dresden, Germany — 2Indian institute of science education and research, Bhopal, India
GdTi3Bi4 crystallizes in layered Ti-based kagome nets intertwined with zigzag Gd chains along the a-axis and orders antiferromagnetically below 15 K. Here, we present the temperature and field-dependent electrical transport of GdTi3Bi4 in different directions. The material exhibits anomalous Hall conductivity of 410 Ω-1 cm-1 at 2 K for B || c and it is completely absent for B || a, despite the similar magnetization observed in both orientations. This behavior is quite contradictory, as anomalous Hall effect (AHE) typically scales with the magnetization. Through first principles calculations, it is demonstrated that in the presence of time reversal symmetry broken by the Gd 4f sublattice and spin orbit coupling, the magnetization direction controls the orbital mixing in the Ti t_2g bands, relocating Berry curvature hot spots and producing the observed orientation selective anomalous Hall conductivity (AHC). The results establish GdTi3Bi4 as platform for investigating new avenues of AHE, such as directional AHE, and thus shed new light on the intricate coupling between magnetic and electronic structures, paving the way for exploring novel quantum phenomena.
Keywords: Kagome; Anomalous Hall effect; magnetic materials; topology; Quantum materials