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<p>Unlike canonical Kondo lattices in <i>f</i>-electron systems, where localized <i>f</i> orbitals naturally provide local moments, <i>d</i>-electron Kondo lattices require a distinct local-moment formation mechanism that remains elusive in bulk materials. Here, we investigate the bilayer kagome metal CsCr<sub>6</sub>Sb<sub>6</sub>, where strong correlations are expected to drive Mott physics in the kagome flat band and thereby supply the requisite local moments. Combining STM/STS and ARPES, we resolve a clear spectroscopic hierarchy. Low-temperature measurements reveal near-<i>E</i><sub>F</sub> signatures, including a Fano-type density-of-states suppression and sharp quasiparticle peaks, both of which vanish upon warming and signal Kondo hybridization. In parallel, symmetric spectroscopic features at approximately 50 meV persist to substantially higher temperatures. This separation of energy and temperature scales supports a two-stage picture in which the flat band first splits into Hubbard bands via strong correlations and the occupied lower Hubbard band supplies local moments that subsequently hybridize with itinerant electrons. Our results thereby move beyond phenomenological descriptions of kagome Kondo lattice candidates and establish Mottness as the microscopic foundation linking strong correlations to Kondo lattice physics in a frustrated <i>d</i>-electron system.</p>

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Mott-derived local moments and Kondo hybridization in a d-electron kagome lattice

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Xing Zhang,
  • Xintong Li,
  • Boqin Song,
  • Yuyang Xie,
  • Qinghong Wang,
  • Taimin Miao,
  • Shusen Ye,
  • Junhao Liu,
  • Bo Liang,
  • Neng Cai,
  • Hao Chen,
  • Wenpei Zhu,
  • Mingkai Xu,
  • Wei-Jian Li,
  • Shun-Li Yu,
  • Shenjin Zhang,
  • Fengfeng Zhang,
  • Feng Yang,
  • Zhimin Wang,
  • Qinjun Peng,
  • Hanqing Mao,
  • Zhihai Zhu,
  • Guodong Liu,
  • Zuyan Xu,
  • Yi-feng Yang,
  • Tianping Ying,
  • Lin Zhao,
  • X. J. Zhou

摘要

Unlike canonical Kondo lattices in f-electron systems, where localized f orbitals naturally provide local moments, d-electron Kondo lattices require a distinct local-moment formation mechanism that remains elusive in bulk materials. Here, we investigate the bilayer kagome metal CsCr6Sb6, where strong correlations are expected to drive Mott physics in the kagome flat band and thereby supply the requisite local moments. Combining STM/STS and ARPES, we resolve a clear spectroscopic hierarchy. Low-temperature measurements reveal near-EF signatures, including a Fano-type density-of-states suppression and sharp quasiparticle peaks, both of which vanish upon warming and signal Kondo hybridization. In parallel, symmetric spectroscopic features at approximately 50 meV persist to substantially higher temperatures. This separation of energy and temperature scales supports a two-stage picture in which the flat band first splits into Hubbard bands via strong correlations and the occupied lower Hubbard band supplies local moments that subsequently hybridize with itinerant electrons. Our results thereby move beyond phenomenological descriptions of kagome Kondo lattice candidates and establish Mottness as the microscopic foundation linking strong correlations to Kondo lattice physics in a frustrated d-electron system.