Contrasting fate of holes introduced by Fe or In in kagome metal CoSn

Abstract

CoSn is a kagome metal with well-defined flat bands 0.2 eV below the Fermi level EF. Moving them across EF would offer a rare opportunity to investigate their impact on electronic properties. Using angle-resolved photoemission spectroscopy (ARPES) and X-ray absorption at the Co K-edge, we examine two routes to introduce holes in this compound, through Co/Fe or Sn/In substitutions. Substituting In for Sn produces an almost rigid upward shift of the bands toward EF, as expected for hole doping, whereas substituting Fe for Co leads to an unexpected downward shift. Density functional theory calculations reproduce these opposite trends and trace the unusual behavior of Fe to its local magnetic moment. The moment keeps the hole on the Fe impurity and imposes an attractive electrostatic potential on neighboring Co atoms. Overall, both substitutions bring weakly dispersing states close to EF, the flat bands of the Co kagome lattice upon In substitution and partly localized states around magnetic Fe impurities upon Fe substitution.

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BibTeX

@misc{brouet2026contrasting,
  title = {{Contrasting fate of holes introduced by Fe or In in kagome metal CoSn}},
  author = {Véronique Brouet and Laure Thomarat and Patrick Le Fèvre and Ethan Saiman and Jean-Pascal Rueff and Oleg Rubel and Victor Balédent and François Bertran},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07848},
  eprint = {2611.07848},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07848},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Contrasting fate of holes introduced by Fe or In in kagome metal CoSn
AU  - Véronique Brouet
AU  - Laure Thomarat
AU  - Patrick Le Fèvre
AU  - Ethan Saiman
AU  - Jean-Pascal Rueff
AU  - Oleg Rubel
AU  - Victor Balédent
AU  - François Bertran
PY  - 2026
DA  - 2026/11/05
PB  - arXiv
DO  - 10.48550/arxiv.2611.07848
UR  - https://arxiv.org/abs/2611.07848
AB  - CoSn is a kagome metal with well-defined flat bands 0.2 eV below the Fermi level EF. Moving them across EF would offer a rare opportunity to investigate their impact on electronic properties. Using angle-resolved photoemission spectroscopy (ARPES) and X-ray absorption at the Co K-edge, we examine two routes to introduce holes in this compound, through Co/Fe or Sn/In substitutions. Substituting In for Sn produces an almost rigid upward shift of the bands toward EF, as expected for hole doping, whereas substituting Fe for Co leads to an unexpected downward shift. Density functional theory calculations reproduce these opposite trends and trace the unusual behavior of Fe to its local magnetic moment. The moment keeps the hole on the Fe impurity and imposes an attractive electrostatic potential on neighboring Co atoms. Overall, both substitutions bring weakly dispersing states close to EF, the flat bands of the Co kagome lattice upon In substitution and partly localized states around magnetic Fe impurities upon Fe substitution.
ER  -

Abstract

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