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

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

doi:10.1007/s11433-025-2773-3

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

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^*

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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(V_1−xCr_x)₃Sb₅ reveal a gradually enhanced band renormalization from CsV₃Sb₅ to CsCr₃Sb₅, accompanied by distinct spatial symmetry breaking states in the phase diagram.

Original language	English
Article number	217412
Journal	Science China: Physics, Mechanics and Astronomy
Volume	69
Issue number	1
DOIs	https://doi.org/10.1007/s11433-025-2773-3
Publication status	Published - Jan 2026

Keywords

ARPES
Kagome lattice
strongly correlated system

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10.1007/s11433-025-2773-3

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Peng, S., Han, Y., Li, Y., Shen, J., Miao, Y., Luo, Y., Huai, L., Ou, Z., Chen, Y., Hu, D., Li, H., Xiang, Z., Liu, Z., Shen, D., Hashimoto, M., Lu, D., Li, X., Qiao, Z., Wang, Z., & He, J. (2026). Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr₃Sb₅. Science China: Physics, Mechanics and Astronomy, 69(1), Article 217412. https://doi.org/10.1007/s11433-025-2773-3

@article{a3a3c8dccbe7405c894504ae582cbb52,

title = "Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr3Sb5",

abstract = "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.",

keywords = "ARPES, Kagome lattice, strongly correlated system",

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 Yuxiang Chen and Deng Hu and Hongyu Li and Ziji Xiang and Zhengtai Liu and Dawei Shen and Makoto Hashimoto and Donghui Lu and Xiang Li and Zhenhua Qiao and Zhiwei Wang and Junfeng He",

note = "Publisher Copyright: {\textcopyright} Science China Press 2025.",

year = "2026",

month = jan,

doi = "10.1007/s11433-025-2773-3",

language = "English",

volume = "69",

journal = "Science China: Physics, Mechanics and Astronomy",

issn = "1674-7348",

publisher = "Science China Press",

number = "1",

}

Peng, S, Han, Y, Li, Y, Shen, J, Miao, Y, Luo, Y, Huai, L, Ou, Z, Chen, Y, Hu, D, Li, H, Xiang, Z, Liu, Z, Shen, D, Hashimoto, M, Lu, D, Li, X, Qiao, Z, Wang, Z & He, J 2026, 'Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr₃Sb₅', Science China: Physics, Mechanics and Astronomy, vol. 69, no. 1, 217412. https://doi.org/10.1007/s11433-025-2773-3

TY - JOUR

T1 - Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr3Sb5

AU - Peng, Shuting

AU - Han, Yulei

AU - Li, Yongkai

AU - Shen, Jianchang

AU - Miao, Yu

AU - Luo, Yang

AU - Huai, Linwei

AU - Ou, Zhipeng

AU - Chen, Yuxiang

AU - Hu, Deng

AU - Li, Hongyu

AU - Xiang, Ziji

AU - Liu, Zhengtai

AU - Shen, Dawei

AU - Hashimoto, Makoto

AU - Lu, Donghui

AU - Li, Xiang

AU - Qiao, Zhenhua

AU - Wang, Zhiwei

AU - He, Junfeng

PY - 2026/1

Y1 - 2026/1

N2 - 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.

AB - 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.

KW - ARPES

KW - Kagome lattice

KW - strongly correlated system

UR - https://www.scopus.com/pages/publications/105021085448

U2 - 10.1007/s11433-025-2773-3

DO - 10.1007/s11433-025-2773-3

M3 - Article

AN - SCOPUS:105021085448

SN - 1674-7348

VL - 69

JO - Science China: Physics, Mechanics and Astronomy

JF - Science China: Physics, Mechanics and Astronomy

IS - 1

M1 - 217412

ER -

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

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Keywords

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