Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+δ

Abstract

The pairing mechanism of high-temperature superconductivity in cuprates remains the biggest unresolved mystery in condensed matter physics. To solve the problem, one of the most effective approaches is to investigate directly the superconducting CuO2 layers. Here, by growing CuO2 monolayer films on Bi2Sr2CaCu2O8+δ substrates, we identify two distinct and spatially separated energy gaps centered at the Fermi energy, a smaller U-like gap and a larger V-like gap on the films, and study their interactions with alien atoms by low-temperature scanning tunneling microscopy. The newly discovered U-like gap exhibits strong phase coherence and is immune to scattering by K, Cs and Ag atoms, suggesting its nature as a nodeless superconducting gap in the CuO2 layers, whereas the V-like gap agrees with the well-known pseudogap state in the underdoped regime. Our results support an s-wave superconductivity in Bi2Sr2CaCu2O8+δ, which, we propose, originates from the modulation-doping resultant two-dimensional hole liquid confined in the CuO2 layers.

7 pages, 5 figures

References in corpus (7)

• Scanning tunneling spectroscopy of high-temperature superconductors
• Energy gaps in high-transition temperature cuprate superconductors
• Fermi Arcs in a Doped Pseudospin-1/2 Heisenberg Antiferromagnet
• Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
• Evolution of the electronic excitation spectrum with strongly diminishing hole-density in superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+δ}
• Extending Universal Nodal Excitations Optimizes Superconductivity in Bi2Sr2CaCu2O8+d
• Universal scaling behavior of the c-axis resistivity of high-temperature superconductors

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