Discovery of charge density wave in a kagome lattice antiferromagnet

Xiaokun Teng, Lebing Chen, Feng Ye, Elliott Rosenberg, Zhaoyu Liu, Jia-Xin Yin, Yu-Xiao Jiang, Ji Seop Oh, M. Zahid Hasan, Kelly J. Neubauer, Bin Gao, Yaofeng Xie, Makoto Hashimoto, Donghui Lu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Robert J. Birgeneau, Jiun-Haw Chu, Ming Yi () and Pengcheng Dai ()
Additional contact information
Xiaokun Teng: Rice University
Lebing Chen: Rice University
Feng Ye: Oak Ridge National Laboratory
Elliott Rosenberg: University of Washington
Zhaoyu Liu: University of Washington
Jia-Xin Yin: Princeton University
Yu-Xiao Jiang: Princeton University
Ji Seop Oh: Rice University
M. Zahid Hasan: Princeton University
Kelly J. Neubauer: Rice University
Bin Gao: Rice University
Yaofeng Xie: Rice University
Makoto Hashimoto: SLAC National Accelerator Laboratory
Donghui Lu: SLAC National Accelerator Laboratory
Chris Jozwiak: Lawrence Berkeley National Laboratory
Aaron Bostwick: Lawrence Berkeley National Laboratory
Eli Rotenberg: Lawrence Berkeley National Laboratory
Robert J. Birgeneau: University of California, Berkeley
Jiun-Haw Chu: University of Washington
Ming Yi: Rice University
Pengcheng Dai: Rice University

Nature, 2022, vol. 609, issue 7927, 490-495

Abstract: Abstract A hallmark of strongly correlated quantum materials is the rich phase diagram resulting from competing and intertwined phases with nearly degenerate ground-state energies1,2. A well-known example is the copper oxides, in which a charge density wave (CDW) is ordered well above and strongly coupled to the magnetic order to form spin-charge-separated stripes that compete with superconductivity1,2. Recently, such rich phase diagrams have also been shown in correlated topological materials. In 2D kagome lattice metals consisting of corner-sharing triangles, the geometry of the lattice can produce flat bands with localized electrons3,4, non-trivial topology5–7, chiral magnetic order8,9, superconductivity and CDW order10–15. Although CDW has been found in weakly electron-correlated non-magnetic AV3Sb5 (A = K, Rb, Cs)10–15, it has not yet been observed in correlated magnetic-ordered kagome lattice metals4,16–21. Here we report the discovery of CDW in the antiferromagnetic (AFM) ordered phase of kagome lattice FeGe (refs. 16–19). The CDW in FeGe occurs at wavevectors identical to that of AV3Sb5 (refs. 10–15), enhances the AFM ordered moment and induces an emergent anomalous Hall effect22,23. Our findings suggest that CDW in FeGe arises from the combination of electron-correlations-driven AFM order and van Hove singularities (vHSs)-driven instability possibly associated with a chiral flux phase24–28, in stark contrast to strongly correlated copper oxides1,2 and nickelates29–31, in which the CDW precedes or accompanies the magnetic order.

Date: 2022
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DOI: 10.1038/s41586-022-05034-z

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