Spatially anisotropic Kondo resonance coupled with superconducting gap in a kagome metal

May 15, 2026

Nature Physics, DOI:10.1038/s41567-026-03292-6 (2026); arXiv:2502.20735 (2025)

Zichen Huang#, Hui Chen#,*, Zhongqin Zhang#, Hao Zhang#, Zhen Zhao, Ruwen Wang, Haitao Yang, Wei Ji*, Ziqiang Wang, Hong-Jun Gao*

Abstract:

The chromium-based kagome metal CsCr3Sb5 has garnered significant interest due to its strong electron correlations, intertwined orders and potential for unconventional superconductivity under high pressure. The evolution of magnetic and superconducting interactions as the more frequently studied CsCr3Sb5 is doped to CsCr3Sb5 remains poorly understood. Here, we demonstrate the emergence of a spatially anisotropic Kondo resonance intertwined with the superconducting gap, enabled by introducing magnetic Cr impurities into the kagome superconductor CsCr3Sb5. The addition of dilute Cr impurities not only weakens long range charge density wave order but also produces local magnetic moments that leads to Kondo resonances. We show that the Kondo resonance forms anisotropic, ripple like spatial patterns around individual Cr atoms, breaking all local mirror symmetries. We further reveal that with the emergence of Kondo screening, the coherence peak and depth of superconducting gap with finite zero-energy conductance are enhanced. This suggests that non superconducting carriers at the Fermi surface in the parent compound participate in the Kondo effect, simultaneously screening Cr magnetic moments and increasing the superfluid density. Our findings offer an opportunity to study the interplay between superconductivity and local magnetism in kagome materials.

DOI: 10.1038/s41567-026-03292-6

  • Fig. 1. Atomic structures of CsV3-xCrxSb5 and evolution of CDWs with Cr concentrations.
  • Fig. 2. Field and temperature evolution of Kondo resonance on the Cr dopants of CsV3-xCrxSb5 (x=0.03).
  • Fig. 3. The anisotropic distribution of Kondo resonance in the real space.
  • Fig. 4. DFT calculations of spin density distribution around a Cr dopant in CsV3Sb5.
  • Fig. 5. Intertwining Kondo resonance with superconductivity in CsV3-xCrxSb5.

Online Preview:

2502.20735v1Download