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arXiv · 2202.01902

Charge order landscape and competition with superconductivity in kagome metals

Mingu Kang·Shiang Fang·Jonggyu Yoo·Brenden R. Ortiz·Yuzki Oey·Jonghyeok Choi·Sae Hee Ryu·Jimin Kim·Chris Jozwiak·Aaron Bostwick·Eli Rotenberg·Efthimios Kaxiras·Joseph G. Checkelsky·Stephen D. Wilson·Jae-Hoon Park·Riccardo Comin
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Abstract

In kagome metals AV3Sb5 (A = K, Rb, Cs), three-dimensional charge order (3D-CO) is the primary instability that sets the stage for other collective orders to emerge, including unidirectional stripe order, orbital flux order, electronic nematicity, and superconductivity. Here, we use high-resolution angle-resolved photoemission spectroscopy to determine the microscopic structure of three-dimensional charge order (3D-CO) in AV3Sb5 and its interplay with superconductivity. Our approach is based on identifying an unusual splitting of kagome bands induced by 3D-CO, which provides a sensitive way to refine the spatial charge patterns in neighboring kagome planes. We found a marked dependence of the 3D-CO structure on composition and doping. The observed difference between CsV3Sb5 and the other compounds potentially underpins the double-dome superconductivity in CsV3(Sb,Sn)5 and the suppression of Tc in KV3Sb5 and RbV3Sb5. Our results provide fresh insights into the rich phase diagram of AV3Sb5.

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Mingu Kang, Shiang Fang, Jonggyu Yoo, Brenden R. Ortiz, Yuzki Oey, Jonghyeok Choi, Sae Hee Ryu, Jimin Kim, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Efthimios Kaxiras, Joseph G. Checkelsky, Stephen D. Wilson, Jae-Hoon Park, Riccardo Comin. 2022-02-03. Charge order landscape and competition with superconductivity in kagome metals. https://doi.org/10.1038/s41563-022-01375-2

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