Electrically controlled superconductor-to-failed insulator transition and giant anomalous Hall effect in kagome metal CsV3Sb5 nanoflakes

Guolin Zheng, Cheng Tan, Zheng Chen, Maoyuan Wang, Xiangde Zhu, Sultan Albarakati, Meri Algarni, James Partridge, Lawrence Farrar, Jianhui Zhou (), Wei Ning (), Mingliang Tian (), Michael S. Fuhrer and Lan Wang ()
Additional contact information
Guolin Zheng: RMIT University
Cheng Tan: RMIT University
Zheng Chen: HFIPS, Chinese Academy of Sciences (CAS)
Maoyuan Wang: Xiamen University
Xiangde Zhu: HFIPS, Chinese Academy of Sciences (CAS)
Sultan Albarakati: RMIT University
Meri Algarni: RMIT University
James Partridge: RMIT University
Lawrence Farrar: RMIT University
Jianhui Zhou: HFIPS, Chinese Academy of Sciences (CAS)
Wei Ning: HFIPS, Chinese Academy of Sciences (CAS)
Mingliang Tian: HFIPS, Chinese Academy of Sciences (CAS)
Michael S. Fuhrer: Monash University
Lan Wang: RMIT University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract The electronic correlations (e.g. unconventional superconductivity (SC), chiral charge order and nematic order) and giant anomalous Hall effect (AHE) in topological kagome metals AV3Sb5 (A = K, Rb, and Cs) have attracted great interest. Electrical control of those correlated electronic states and AHE allows us to resolve their own nature and origin and to discover new quantum phenomena. Here, we show that electrically controlled proton intercalation has significant impacts on striking quantum phenomena in CsV3Sb5 nanodevices mainly through inducing disorders in thinner nanoflakes and carrier density modulation in thicker ones. Specifically, in disordered thin nanoflakes (below 25 nm), we achieve a quantum phase transition from a superconductor to a “failed insulator” with a large saturated sheet resistance for T → 0 K. Meanwhile, the carrier density modulation in thicker nanoflakes shifts the Fermi level across the charge density wave (CDW) gap and gives rise to an extrinsic-intrinsic transition of AHE. With the first-principles calculations, the extrinsic skew scattering of holes in the nearly flat bands with finite Berry curvature by multiple impurities would account for the giant AHE. Our work uncovers a distinct disorder-driven bosonic superconductor-insulator transition (SIT), outlines a global picture of the giant AHE and reveals its correlation with the unconventional CDW in the AV3Sb5 family.

Date: 2023
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DOI: 10.1038/s41467-023-36208-6

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