Vacancy-induced suppression of charge density wave order and its impact on magnetic order in kagome antiferromagnet FeGe
Two-dimensional (2D) kagome lattice metals are interesting because their corner sharing triangle structure enables a wide array of electronic and magnetic phenomena. Recently, post-growth annealing is shown to both suppress charge density wave (CDW) order and establish long-range CDW with the ability to cycle between states repeatedly in the kagome antiferromagnet FeGe. Here we perform transport, neutron scattering, scanning transmission electron microscopy (STEM), and muon spin rotation (μSR) experiments to unveil the microscopic mechanism of the annealing process and its impact on magneto-transport, CDW, and magnetism in FeGe. Annealing at 560 °C creates uniformly distributed Ge vacancies, preventing the formation of Ge-Ge dimers and thus CDW, while 320 °C annealing concentrates vacancies into stoichiometric FeGe regions with long-range CDW. The presence of CDW order greatly affects the anomalous Hall effect, incommensurate magnetic order, and spin-lattice coupling in FeGe, placing FeGe as the only kagome lattice material with tunable CDW and magnetic order.
Authors
- J. Judy (ORCID: https://orcid.org/0000-0002-6346-2814)
- Wei Tian (ORCID: https://orcid.org/0000-0002-5670-060X)
- Y. H. Chang (ORCID: https://orcid.org/0000-0003-2702-6094)
- Saif Siddique (ORCID: https://orcid.org/0000-0003-0300-1087)
- Mason Klemm (ORCID: https://orcid.org/0000-0001-7300-5150)
- Pengcheng Dai (ORCID: https://orcid.org/0000-0002-6088-3170)
- Bin Gao (ORCID: https://orcid.org/0000-0002-2853-2362)
- Masaaki Matsuda (ORCID: https://orcid.org/0000-0003-2209-9526)
- Hubertus Luetkens (ORCID: https://orcid.org/0000-0002-5842-9788)
- Tanner J. Legvold (ORCID: https://orcid.org/0009-0007-0956-3108)
- Huibo B. Cao (ORCID: https://orcid.org/0000-0002-5970-4980)
- Yiqing Hao (ORCID: https://orcid.org/0000-0001-5721-3224)
- Yaofeng Xie (ORCID: https://orcid.org/0000-0003-4235-9188)
- Xiaokun Teng (ORCID: https://orcid.org/0000-0002-7185-085X)
- Mehrdad T. Kiani (ORCID: https://orcid.org/0000-0002-9301-457X)
- Douglas Natelson (ORCID: https://orcid.org/0000-0003-2370-9859)
- Feng Ye (ORCID: https://orcid.org/0000-0001-7477-4648)
- Ming Yi (ORCID: https://orcid.org/0000-0001-7534-3049)
- Sijie Xu (ORCID: https://orcid.org/0000-0002-5219-9862)
- C.-L. Huang (ORCID: https://orcid.org/0009-0000-4855-0501)
- Zurab Guguchia (ORCID: https://orcid.org/0000-0002-5498-328X)
Institutions
- Oak Ridge National Laboratory (US)
- Cornell University (US)
- Paul Scherrer Institute (CH)
- National Science and Technology Council (TW)
- Rice University (US)
- National Cheng Kung University (TW)
Publication Details
- Journal
- Nature Communications
- Published
- 2025-04-07
- DOI
- https://doi.org/10.1038/s41467-025-58583-y
- Citations
- 7
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 8.81
Funders
- National Science Foundation
- U.S. Department of Energy
- Gordon and Betty Moore Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- National Cheng Kung University
- National Science and Technology Council
- Office of Science
- Cornell Center for Materials Research
- Kavli Institute at Cornell, Cornell University
- Division of Materials Research
- Oak Ridge National Laboratory