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Charge order landscape and competition with superconductivity in kagome metals.

Mingu KangShiang FangJonggyu YooBrenden R OrtizYuzki M OeyJonghyeok ChoiSae Hee RyuJimin KimChristopher JozwiakAaron BostwickEli RotenbergEfthimios KaxirasJoseph G CheckelskyStephen D WilsonJae-Hoon ParkRiccardo Comin
Published in: Nature materials (2022)
In the kagome metals AV 3 Sb 5 (A = K, Rb, Cs), three-dimensional charge order 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 in AV 3 Sb 5 and its interplay with superconductivity. Our approach is based on identifying an unusual splitting of kagome bands induced by three-dimensional charge order, which provides a sensitive way to refine the spatial charge patterns in neighbouring kagome planes. We found a marked dependence of the three-dimensional charge order structure on composition and doping. The observed difference between CsV 3 Sb 5 and the other compounds potentially underpins the double-dome superconductivity in CsV 3 (Sb,Sn) 5 and the suppression of T c in KV 3 Sb 5 and RbV 3 Sb 5 . Our results provide fresh insights into the rich phase diagram of AV 3 Sb 5 .
Keyphrases
  • high resolution
  • magnetic resonance imaging
  • computed tomography
  • single cell
  • single molecule
  • heavy metals
  • liquid chromatography