Berry curvature induced giant anomalous and spin texture driven Hall responses in the layered kagome antiferromagnet GdTi3Bi4

TL;DR

This study reports on GdTi3Bi4, a layered kagome antiferromagnet exhibiting giant anomalous Hall effects driven by Berry curvature and complex spin textures, supported by experimental and theoretical analyses.

Contribution

The paper introduces GdTi3Bi4 as a new layered kagome magnet with significant Berry curvature effects and detailed insights into its magnetic and transport properties.

Findings

Colossal anomalous Hall conductivity at 2 K (~8.6×10^3 Ohm^-1 cm^-1)

Presence of noncollinear spin textures and spin-cluster-like glassy phase

Berry curvature and skew scattering both contribute to Hall response

Abstract

In recent years, layered kagome magnets have emerged as promising platforms for Berry-curvature engineering and unconventional transport phenomena. 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, reveals the formation of a spin-cluster-like glassy magnetic phase attributed to noncollinear spin textures. Additionally, the system demonstrates a colossal anomalous Hall conductivity {\sigma}_xy^{A}~ 8.6(7)10^{3} Ohm-1 cm-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 flat-band near the Fermi level, with f-electrons of the Gd ion contributing large intrinsic Hall response. Thus, GdTi3Bi4 emerges as a rare layered kagome magnet, exhibiting Berry curvature-induced giant anomalous and spin texture-driven Hall responses, providing a versatile platform for exploring spin-texture physics and advancing low-dimensional spintronic functionalities.