Distinct Superconducting Gap on Two Bilayer-Split Fermi Surface Sheets in $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ Superconductor

Abstract

High resolution laser-based angle-resolved photoemission measurements were carried out on an overdoped $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ superconductor with a Tc of 75 K. Two Fermi surface sheets caused by bilayer splitting are clearly identified with rather different doping levels: the bonding sheet corresponds to a doping level of 0.14 which is slightly underdoped while the antibonding sheet has a doping of 0.27 that is heavily overdoped, giving an overall doping level of 0.20 for the sample. Different superconducting gap sizes on the two Fermi surface sheets are revealed for the first time. The superconducting gap on the antibonding Fermi surface sheet follows a standard d-wave form while it deviates from the standard d-wave form for the bonding Fermi surface sheet. The maximum gap difference between the two Fermi surface sheets near the antinodal region is $\sim$2 meV. These observations provide important information for studying the relationship between the Fermi surface topology and superconductivity, and the layer-dependent superconductivity in high temperature cuprate superconductors.

19 pages, 5 figures

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• Ab initio description of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ electronic structure
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• ARPES Detection of Superconducting Gap Sign in Unconventional Superconductors
• Superconductivity in bilayer $t$-$t^{\prime }$ Hubbard models
• Selective Hybridization between Main Band and Superstructure Band in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ Superconductor
• Enhanced superconducting gap in the outer CuO${}_2$ plane of the trilayer cuprate (Hg,Re)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Renormalization of electrons in bilayer cuprate superconductors
• Hidden self-energies as origin of cuprate superconductivity revealed by machine learning
• Superconducting phase interference effect in momentum space
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$
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• Emergence of Fermi-liquid and BCS physics in overdoped cuprates