Anomalous Fermi-Surface Dependent Pairing in a Self-Doped High-Tc Superconductor

Abstract

We report the discovery of a self-doped multi-layer high Tc superconductor Ba2Ca3Cu4O8F2(F0234) which contains distinctly different superconducting gap magnitudes along its two Fermi surface(FS) sheets. While formal valence counting would imply this material to be an undoped insulator, it is a self-doped superconductor with a Tc of 60K, possessing simultaneously both electron- and hole-doped FS sheets. Intriguingly, the FS sheet characterized by the much larger gap is the electron-doped one, which has a shape disfavoring two electronic features considered to be important for the pairing mechanism: the van Hove singularity and the antiferromagnetic (Pi/a, Pi/a) scattering.

4 pages, 5 figures; accepted by Phys. Rev. Lett

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• Uniform Mixing of Antiferromagnetism and High-Tc Superconductivity in Electron-doped Layers in Four-layered Ba2Ca3Cu4O8F2 : A New Phenomenon in an Electron Underdoped RegimePhenomenon in an Electron Underdoped Regime
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• Uniform mixing of antiferromagnetism and high-T_c superconductivity in multilayered copper oxides Ba_2Ca_{n-1}Cu_nO_{2n}F_2 with apical fluorines (n=2,3,4): Cu-NMR/NQR and F-NMR
• The dynamical frustration of interlayer excitons delocalizing in bilayer quantum antiferromagnets
• Insights from ARPES for an undoped, four-layered, two-gap high-T_c superconductor
• Multilayered cuprate superconductor Ba${}_2$Ca${}_5$Cu${}_6$O${}_{12}$(O${}_{1-x}$,F${}_x$)${}_2$ studied by temperature-dependent scanning tunneling microscopy and spectroscopy
• Dynamics of a single exciton in strongly correlated bilayers
• Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model
• Theoretical investigation of the four-layered self-doped high-T${}_c$ superconductors: evidence of pair tunneling effect
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$
• Persistent Fermi Pockets and Robust Electron Pairing in Lightly Doped CuO${}_2$ Planes of Cuprate Superconductors