Spin excitations and flat electronic bands in a Cr-based kagome superconductor

Zehao Wang, Yucheng Guo, Hsiao-Yu Huang, Fang Xie, Yuefei Huang, Bin Gao, Ji Seop Oh, Han Wu, Jun Okamoto, Ganesha Channagowdra, Chien-Te Chen, Feng Ye, Xingye Lu, Zhaoyu Liu, Zheng Ren, Yuan Fang, Yiming Wang, Ananya Biswas, Yichen Zhang, Ziqin Yue, Cheng Hu, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Makoto Hashimoto, Donghui Lu, Junichiro Kono, Jiun-Haw Chu, Boris I. Yakobson, Robert J. Birgeneau, Guang-Han Cao, Atsushi Fujimori, Di-Jing Huang (), Qimiao Si (), Ming Yi () and Pengcheng Dai ()
Additional contact information
Zehao Wang: Rice University
Yucheng Guo: Rice University
Hsiao-Yu Huang: National Synchrotron Radiation Research Center
Fang Xie: Rice University
Yuefei Huang: Rice University
Bin Gao: Rice University
Ji Seop Oh: Rice University
Han Wu: Rice University
Jun Okamoto: National Synchrotron Radiation Research Center
Ganesha Channagowdra: National Synchrotron Radiation Research Center
Chien-Te Chen: National Synchrotron Radiation Research Center
Feng Ye: Oak Ridge National Laboratory
Xingye Lu: Beijing Normal University
Zhaoyu Liu: University of Washington
Zheng Ren: Rice University
Yuan Fang: Rice University
Yiming Wang: Rice University
Ananya Biswas: Rice University
Yichen Zhang: Rice University
Ziqin Yue: Rice University
Cheng Hu: Lawrence Berkeley National Laboratory
Chris Jozwiak: Lawrence Berkeley National Laboratory
Aaron Bostwick: Lawrence Berkeley National Laboratory
Eli Rotenberg: Lawrence Berkeley National Laboratory
Makoto Hashimoto: SLAC National Accelerator Laboratory
Donghui Lu: SLAC National Accelerator Laboratory
Junichiro Kono: Rice University
Jiun-Haw Chu: University of Washington
Boris I. Yakobson: Rice University
Robert J. Birgeneau: University of California
Guang-Han Cao: Zhejiang University
Atsushi Fujimori: National Synchrotron Radiation Research Center
Di-Jing Huang: National Synchrotron Radiation Research Center
Qimiao Si: Rice University
Ming Yi: Rice University
Pengcheng Dai: Rice University

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract In the quest for topology- and correlation-driven quantum states, kagome lattice materials have garnered significant interest for their band structures, featuring flat bands (FBs) from the quantum destructive interference of the electronic wavefunction. Tuning an FB to the chemical potential could induce electronic instabilities and emergent orders. Despite extensive studies, direct evidence of FBs tuned to the chemical potential and their role in emergent orders in bulk materials remains lacking. Using angle-resolved photoemission spectroscopy, resonant inelastic X-ray scattering, and density functional theory, we show that the low-energy structure of the Cr-based kagome metal superconductor CsCr3Sb5 is dominated by FBs at the Fermi level. We also observe low-energy magnetic excitations evolving across the low-temperature transition, largely consistent with the FB shift. Our results suggest that the low-temperature order contains a magnetic origin and that the kagome FBs may play a role in the emergence of this order.

Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-025-62298-5 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-62298-5

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-025-62298-5

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().