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Signatures of Kondo-lattice behavior in the two-dimensional ferromagnet Fe3GeTe2

Carmen Rubio-Verdú1,2,* and Katharina J. Franke3

  • *Contact author: carmen.rubio@icfo.eu
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Phys. Rev. B 113, 235410 – Published 4 June, 2026

DOI: https://doi.org/10.1103/89g1-jdx2

Abstract

Fe3GeTe2 is a paradigmatic van der Waals magnet with the full microscopic picture of magnetic interactions still under debate. Here, we use scanning tunneling microscopy and spectroscopy at 1.1 K to map out the low-energy physics on the surface. In agreement with previous works, we observe a spatially varying Fano line shape that has been ascribed to a Kondo resonance. In addition, we identify a small gap of ≈2.3meV width on top of the larger-energy Fano resonance. We suggest that this gap is the signature of a coherent Kondo lattice that has been proposed to originate from hybridization of a strongly dispersing and a flat band both derived from d electrons of the Fe atoms in the lattice. Adding magnetic adatoms on the surface hardly influences the magnetic signatures of the substrate, indicating the robustness of the intralayer Kondo correlations against magnetic adsorbates.

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Phys. Rev. B 113, 235410– Published 4 June, 2026
  • Received 19 September 2025
  • Revised 11 February 2026
  • Accepted 19 March 2026
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