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<p>Kagome metal CsV<sub>3</sub>Sb<sub>5</sub> has attracted much recent attention due to the coexistence of multiple exotic orders and the associated proposals to mimic unconventional high temperature superconductors. Nevertheless, magnetism and strong electronic correlations—two essential ingredients for unconventional superconductivity, are absent in this V-based Kagome metal. CsCr<sub>3</sub>Sb<sub>5</sub> is a newly discovered Cr-based parallel of CsV<sub>3</sub>Sb<sub>5</sub>, in which magnetism appears with charge density wave and superconductivity at different temperature and pressure regions. Enhanced electronic correlations are also suggested by theoretical proposals due to the calculated flat bands. Here, we report angle-resolved photoemission measurements and first-principles calculations on this new material system. Electron energy bands and the associated orbitals are resolved. Flat bands are observed near the Fermi level. Doping dependent measurements on Cs(V<sub>1−<i>x</i></sub>Cr<sub><i>x</i></sub>)<sub>3</sub>Sb<sub>5</sub> reveal a gradually enhanced band renormalization from CsV<sub>3</sub>Sb<sub>5</sub> to CsCr<sub>3</sub>Sb<sub>5</sub>, accompanied by distinct spatial symmetry breaking states in the phase diagram.</p>

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Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr3Sb5

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Shuting Peng,
  • Yulei Han,
  • Yongkai Li,
  • Jianchang Shen,
  • Yu Miao,
  • Yang Luo,
  • Linwei Huai,
  • Zhipeng Ou,
  • Yuxiang Chen,
  • Deng Hu,
  • Hongyu Li,
  • Ziji Xiang,
  • Zhengtai Liu,
  • Dawei Shen,
  • Makoto Hashimoto,
  • Donghui Lu,
  • Xiang Li,
  • Zhenhua Qiao,
  • Zhiwei Wang,
  • Junfeng He

摘要

Kagome metal CsV3Sb5 has attracted much recent attention due to the coexistence of multiple exotic orders and the associated proposals to mimic unconventional high temperature superconductors. Nevertheless, magnetism and strong electronic correlations—two essential ingredients for unconventional superconductivity, are absent in this V-based Kagome metal. CsCr3Sb5 is a newly discovered Cr-based parallel of CsV3Sb5, in which magnetism appears with charge density wave and superconductivity at different temperature and pressure regions. Enhanced electronic correlations are also suggested by theoretical proposals due to the calculated flat bands. Here, we report angle-resolved photoemission measurements and first-principles calculations on this new material system. Electron energy bands and the associated orbitals are resolved. Flat bands are observed near the Fermi level. Doping dependent measurements on Cs(V1−xCrx)3Sb5 reveal a gradually enhanced band renormalization from CsV3Sb5 to CsCr3Sb5, accompanied by distinct spatial symmetry breaking states in the phase diagram.