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Vacancy-induced suppression of charge density wave order and its impact on magnetic order in kagome antiferromagnet FeGe

Author

Listed:
  • Mason L. Klemm

    (Rice University)

  • Saif Siddique

    (Cornell University)

  • Yuan-Chun Chang

    (National Cheng Kung University)

  • Sijie Xu

    (Rice University)

  • Yaofeng Xie

    (Rice University)

  • Tanner Legvold

    (Rice University)

  • Mehrdad T. Kiani

    (Cornell University)

  • Xiaokun Teng

    (Rice University)

  • Bin Gao

    (Rice University)

  • Feng Ye

    (Oak Ridge National Laboratory)

  • Huibo Cao

    (Oak Ridge National Laboratory)

  • Yiqing Hao

    (Oak Ridge National Laboratory)

  • Wei Tian

    (Oak Ridge National Laboratory)

  • Hubertus Luetkens

    (PSI Center for Neutron and Muon Sciences)

  • Masaaki Matsuda

    (Oak Ridge National Laboratory)

  • Douglas Natelson

    (Rice University)

  • Zurab Guguchia

    (PSI Center for Neutron and Muon Sciences)

  • Chien-Lung Huang

    (National Cheng Kung University
    National Science and Technology Council)

  • Ming Yi

    (Rice University)

  • Judy J. Cha

    (Cornell University)

  • Pengcheng Dai

    (Rice University)

Abstract

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.

Suggested Citation

  • Mason L. Klemm & Saif Siddique & Yuan-Chun Chang & Sijie Xu & Yaofeng Xie & Tanner Legvold & Mehrdad T. Kiani & Xiaokun Teng & Bin Gao & Feng Ye & Huibo Cao & Yiqing Hao & Wei Tian & Hubertus Luetkens, 2025. "Vacancy-induced suppression of charge density wave order and its impact on magnetic order in kagome antiferromagnet FeGe," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-58583-y
    DOI: 10.1038/s41467-025-58583-y
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