Anomalous Electrical Transport in the Kagome Magnet <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><msub><mrow><mi>YbFe</mi></mrow><mrow><mn>6</mn></mrow></msub></mrow><mrow><msub><mrow><mi>Ge</mi></mrow><mrow><mn>6</mn></mrow></msub></mrow></mrow></math>

Weiliang Yao; Supeng Liu; Hodaka Kikuchi; Hajime Ishikawa; Øystein S. Fjellvåg; David W. Tam; Feng Ye; Douglas L. Abernathy; George D. A. Wood; Devashibhai Adroja; Chun-Ming Wu; Chien-Lung Huang; Bin Gao; Yaofeng Xie; Yuxiang Gao; Karthik Rao; Emilia Morosan; Koichi Kindo; Takatsugu Masuda; Kenichiro Hashimoto; Takasada Shibauchi; Pengcheng Dai

doi:10.1103/PhysRevLett.134.186501

Anomalous Electrical Transport in the Kagome Magnet ${YbFe}_{6} {Ge}_{6}$

Weiliang Yao^1,2,*, Supeng Liu², Hodaka Kikuchi ³, Hajime Ishikawa³, Øystein S. Fjellvåg ^4,5, David W. Tam⁴, Feng Ye ⁶, Douglas L. Abernathy⁶, George D. A. Wood ⁷ et al.

Devashibhai Adroja^7,8, Chun-Ming Wu⁹, Chien-Lung Huang¹⁰, Bin Gao ¹, Yaofeng Xie¹, Yuxiang Gao¹, Karthik Rao¹, Emilia Morosan^1,11, Koichi Kindo³, Takatsugu Masuda ³, Kenichiro Hashimoto ², Takasada Shibauchi ^2,†, and Pengcheng Dai ^1,11,‡

¹Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
²Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
³Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
⁴Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen 5232, Switzerland
⁵Department for Hydrogen Technology, Institute for Energy Technology, NO-2027 Kjeller, Norway
⁶Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
⁷ISIS Facility, STFC, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
⁸Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, Auckland Park 2006, South Africa
⁹National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
¹⁰Department of Physics and Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan 701, Taiwan
¹¹Smalley-Curl Institute, Rice University, Houston, Texas 77005, USA

^*Contact author: wy28@rice.edu
^†Contact author: shibauchi@k.u-tokyo.ac.jp
^‡Contact author: pdai@rice.edu

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Phys. Rev. Lett. 134, 186501 – Published 6 May, 2025

DOI: https://doi.org/10.1103/PhysRevLett.134.186501

Abstract

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 ${YbFe}_{6} {Ge}_{6}$ , where the Fe moments in the 2D kagome layers exhibit an $A$ -type collinear antiferromagnetic order below $T_{N} \approx 500 K$ . 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 $T_{SR} \approx 63 K$ . 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 Letter demonstrates that spin fluctuations may provide an additional scattering channel for the conduction electrons and give rise to AHE even in a collinear antiferromagnet.

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Anomalous Electrical Transport in the Kagome Magnet ${YbFe}_{6} {Ge}_{6}$

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Anomalous Electrical Transport in the Kagome Magnet YbFe6Ge6

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Anomalous Electrical Transport in the Kagome Magnet ${YbFe}_{6} {Ge}_{6}$