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−x)3Sb5 reveal a gradually enhanced band renormalization from CsV3Sb5 to CsCr3Sb5, accompanied by distinct spatial symmetry breaking states in the phase diagram.
@article{arxiv.2406.17769,
title = {Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr$_3$Sb$_5$},
author = {Shuting Peng and Yulei Han and Yongkai Li and Jianchang Shen and Yu Miao and Yang Luo and Linwei Huai and Zhipeng Ou and Hongyu Li and Ziji Xiang and Zhengtai Liu and Dawei Shen and Makoto Hashimoto and Donghui Lu and Yugui Yao and Zhenhua Qiao and Zhiwei Wang and Junfeng He},
journal= {arXiv preprint arXiv:2406.17769},
year = {2026}
}