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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 (CrₓV₁-ₗ) ₃Sb₅ reveal a gradually enhanced band renormalization from CsV₃Sb₅ to CsCr₃Sb₅, accompanied by distinct spatial symmetry breaking states in the phase diagram.
Peng et al. (Tue,) studied this question.