Two-dimensional (2D) kagome metals offer a unique platform for exploring electron correlation phenomena derived from quantum many-body effects. Here, we report a combined study of electrical magnetotransport and neutron scattering on YbFe6Ge6, where the Fe moments in the 2D kagome layers exhibit an A-type collinear antiferromagnetic order below TN≈500 K. Interactions between the Fe ions in the layers and the localized Yb magnetic ions in between reorient the c-axis aligned Fe moments to the kagome plane below TSR≈63 K. Our magnetotransport measurements show an intriguing anomalous Hall effect (AHE) that emerges in the spin-reorientated collinear state, accompanied by the closing of the spin anisotropy gap as revealed from inelastic neutron scattering. The gapless spin excitations and the Yb-Fe interaction are able to support a dynamic scalar spin chirality, which explains the observed AHE. Therefore, our study demonstrates spin fluctuations may provide an additional scattering channel for the conduction electrons and give rise to AHE even in a collinear antiferromagnet.
@article{arxiv.2504.12454,
title = {Anomalous Electrical Transport in the Kagome Magnet YbFe$_6$Ge$_6$},
author = {Weiliang Yao and Supeng Liu and Hodaka Kikuchi and Hajime Ishikawa and Øystein S. Fjellvåg and David W. Tam and Feng Ye and Douglas L. Abernathy and George D. A. Wood and Devashibhai Adroja and Chun-Ming Wu and Chien-Lung Huang and Bin Gao and Yaofeng Xie and Yuxiang Gao and Karthik Rao and Emilia Morosan and Koichi Kindo and Takatsugu Masuda and Kenichiro Hashimoto and Takasada Shibauchi and Pengcheng Dai},
journal= {arXiv preprint arXiv:2504.12454},
year = {2026}
}