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<p>The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order (CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angle-resolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the <i>K</i> point and another around the <i>A</i> point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe, in contrast to the conventional nesting-driven mechanisms.</p>

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Photoemission evidence of a novel charge order in kagome metal FeGe

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Zhisheng Zhao,
  • Tongrui Li,
  • Peng Li,
  • Xueliang Wu,
  • Jianghao Yao,
  • Ziyuan Chen,
  • Yajun Yan,
  • Shengtao Cui,
  • Zhe Sun,
  • Yichen Yang,
  • Zhicheng Jiang,
  • Zhengtai Liu,
  • Alex Louat,
  • Timur Kim,
  • Cephise Cacho,
  • Aifeng Wang,
  • Yilin Wang,
  • Dawei Shen,
  • Juan Jiang,
  • Donglai Feng

摘要

The kagome metal FeGe provides a rich platform for understanding the mechanisms behind competing orders, as it exhibits charge order (CO) emerging deep within the antiferromagnetic phase. To investigate the intrinsic origin of this behavior, we examine the evolution of the low-energy electronic structure across the phase transition in annealed FeGe samples using angle-resolved photoemission spectroscopy. We find no evidence supporting a conventional nesting mechanism, such as Fermi surface nesting or van Hove singularities. However, we observe two notable changes in the band structure: an electron-like band around the K point and another around the A point, both shifting upward in energy when CO forms. These findings are consistent with our density-functional theory calculations, which suggest that the charge order in FeGe is primarily driven by magnetic energy savings due to a lattice distortion involving Ge1-dimerization. Our results provide photoemission evidence supporting this novel mechanism for CO formation in FeGe, in contrast to the conventional nesting-driven mechanisms.