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03 July 2022
 
  » arxiv » 1911.8768

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Coexistence of full-gap superconductivity and pseudogap in two-dimensional fullerides
Ming-Qiang Ren ; Sha Han ; Shu-Ze Wang ; Jia-Qi Fan ; Can-Li Song ; Xu-Cun Ma ; Qi-Kun Xue ;
Date 20 Nov 2019
AbstractAlkali-fulleride superconductors with a maximum critical temperature Tc of 40 K exhibit similar electronic phase diagram with unconventional high-Tc superconductors where the superconductivity resides proximate to a magnetic Mott-insulating state. However, distinct from cuprate compounds, which superconduct through two-dimensional (2D) CuO2 planes, alkali fullerides are attributed to the three-dimensional (3D) members of high-Tc family. Here, we employ scanning tunneling microscopy to show that trilayer K3C60 displays fully gapped strong coupling s-wave superconductivity that coexists spatially with a cuprate-like pseudogap state above Tc = 22 K and within vortices. A precise control of electronic correlations and doping reveals that superconductivity occurs near a superconductor-Mott insulator transition and reaches maximum at half-filling. The s-wave symmetry retains over the entire phase diagram, which, in conjunction with an abrupt decline of superconductivity below half-filling, demonstrates that alkali fullerides are predominantly phonon-mediated superconductors, although the multiorbital electronic correlations also come into play.
Source arXiv, 1911.8768
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