Intertwining of Magnetism and Charge Ordering in Kagome FeGe

Sen Shao, Jia Xin Yin, Ilya Belopolski, Jing Yang You, Tao Hou, Hongyu Chen, Yuxiao Jiang, Md Shafayat Hossain, Mohammad Yahyavi, Chia Hsiu Hsu, Yuan Ping Feng, Arun Bansil, M. Zahid Hasan, Guoqing Chang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Recent experiments report a charge density wave (CDW) in the antiferromagnet FeGe, but the nature of the charge ordering and the associated structural distortion remains elusive. We discuss the structural and electronic properties of FeGe. Our proposed ground state phase accurately captures atomic topographies acquired by scanning tunneling microscopy. We show that the 2 × 2 × 1 CDW likely results from the Fermi surface nesting of hexagonal-prism-shaped kagome states. FeGe is found to exhibit distortions in the positions of the Ge atoms instead of the Fe atoms in the kagome layers. Using in-depth first-principles calculations and analytical modeling, we demonstrate that this unconventional distortion is driven by the intertwining of magnetic exchange coupling and CDW interactions in this kagome material. The movement of Ge atoms from their pristine positions also enhances the magnetic moment of the Fe kagome layers. Our study indicates that magnetic kagome lattices provide a material candidate for exploring the effects of strong electronic correlations on the ground state and their implications for transport, magnetic, and optical responses in materials.

Original languageEnglish (US)
Pages (from-to)10164-10171
Number of pages8
JournalACS Nano
Volume17
Issue number11
DOIs
StatePublished - Jun 13 2023

All Science Journal Classification (ASJC) codes

  • General Engineering
  • General Materials Science
  • General Physics and Astronomy

Keywords

  • charge density wave
  • crystal structure
  • electronic properties
  • first-principles calculations
  • intertwined orders
  • kagome antiferromagnet

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