Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 61: Topology – Poster
TT 61.4: Poster
Wednesday, March 11, 2026, 15:00–17:00, P4
Berry curvature induced giant anomalous and spin texture driven Hall responses in the layered Kagome antiferromagnet GdTi3Bi4 — •Shobha Singh1, Shivam Rathod1, Rong Chen2, Lipika Lipika1, Sneh Sneh1, Rie. Y Umetsu3,4, Yan Sun2, and Kaustuv Manna1 — 1Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India — 2Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences 72 Wenhua Road, Shenyang 110016, China. — 3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan — 4Center for Science and Innovation in Spintronics, Tohoku University, Sendai 980-8577, Japan
Here, we present the single-crystal growth, magnetization, and electrical transport characterizations of the van der Waals-like layered antiferromagnet GdTi3Bi4.The system exhibits pronounced field-induced first-order phase transitions. Comprehensive frequency, temperature, and field-dependent ac susceptibility measurements, and Hall analysis, reveal the formation of a spin-cluster-like glassy magnetic phase attributed to noncoplanar spin textures. Additionally, the system demonstrates a colossal anomalous Hall conductivity (σxy = 8652 Ω−1cm−1 at 2 K). Detailed scaling analyses reveal the coexistence of skew scattering and intrinsic Berry-curvature contributions to the anomalous Hall effect. First-principles calculations highlight a flat band near the Fermi level, with f-electrons of the Gd ion contributing a large intrinsic Hall response.
Keywords: 2D antiferromagnet; quantum magnet; Berry curvature; anomalous Hall effect; topological Hall effect