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 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 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.
| Original language | English |
|---|---|
| Article number | 186501 |
| Journal | Physical Review Letters |
| Volume | 134 |
| Issue number | 18 |
| DOIs | |
| State | Published - May 9 2025 |
Funding
The neutron scattering and single-crystal synthesis work at Rice was supported by U.S. NSF-DMR-2401084 and by the Robert A. Welch Foundation under Grant No. C-1839 (P.D.), respectively. The transport work at the University of Tokyo was supported by Grant-in-Aid for Scientific Research (KAKENHI) (Grant No. JP22H00105), Grant-in-Aid for Scientific Research on Innovative Areas Quantum Liquid Crystals (Grant No. JP19H05824) and Grant-in-Aid for Transformative Research Areas (A) Correlation Design Science (Grant No. JP25H01248) from Japan Society for the Promotion of Science. W.Y. acknowledges support from the US NSF-OISE-2201516 under the Accelnet program of the Office of International Science and Engineering (OISE). P.D. also acknowledges travel support from the U.S. NSF-OISE-2201516. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The beam time was allocated to CORELLI on Proposal No. IPTS-31865.1 and ARCS on Proposal No. IPTS-32630.1. The experiment at the ISIS Neutron and Muon Source was supported by a beam time allocation No. RB2410134 from the Science and Technology Facilities Council. S.F. acknowledges funding from the Research Council of Norway through Project No. 325345. This work is in part based on work performed at the DMC instrument at SINQ at the Paul Scherrer Institute. Small-angle neutron scattering was performed at QUOKKA, ANSTO under Proposal No. P18792. C.L.H. acknowledges the support by the National Science and Technology Council in Taiwan (NSTC No. 113-2112-M-006-027). The neutron scattering and single-crystal synthesis work at Rice was supported by U.S. NSF-DMR-2401084 and by the Robert A. Welch Foundation under Grant No. C-1839 (P. D.), respectively. The transport work at the University of Tokyo was supported by Grant-in-Aid for Scientific Research (KAKENHI) (Grant No. JP22H00105), Grant-in-Aid for Scientific Research on Innovative Areas “Quantum Liquid Crystals” (Grant No. JP19H05824) and Grant-in-Aid for Transformative Research Areas (A) “Correlation Design Science” (Grant No. JP25H01248) from Japan Society for the Promotion of Science. W. Y. acknowledges support from the US NSF-OISE-2201516 under the Accelnet program of the Office of International Science and Engineering (OISE). P. D. also acknowledges travel support from the U.S. NSF-OISE-2201516. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The beam time was allocated to CORELLI on Proposal No. IPTS-31865.1 and ARCS on Proposal No. IPTS-32630.1. The experiment at the ISIS Neutron and Muon Source was supported by a beam time allocation No. RB2410134 from the Science and Technology Facilities Council. Ø. S. F. acknowledges funding from the Research Council of Norway through Project No. 325345. This work is in part based on work performed at the DMC instrument at SINQ at the Paul Scherrer Institute. Small-angle neutron scattering was performed at QUOKKA, ANSTO under Proposal No. P18792. C. L. H. acknowledges the support by the National Science and Technology Council in Taiwan (NSTC No. 113-2112-M-006-027).