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Weak coupling Bardeen-Cooper-Schrieffer suerconductivity in the Electron-Doped Cuprate Superconductors

L. Shan·Y. Huang·Y. L. Wang·Shiliang Li·Jun Zhao·Pengcheng Dai·Y. Z. Zhang·C. Ren·H. H. Wen
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Abstract

We use in-plane tunneling spectroscopy to study the temperature dependence of the local superconducting gap $Δ(T)$ in electron-doped copper oxides with various $T_c$'s and Ce-doping concentrations. We show that the temperature dependence of $Δ(T)$ follows the expectation of the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity, where $Δ(0)/k_{B}T_{c}\approx1.72\pm 0.15$ and $Δ(0)$ is the average superconducting gap across the Fermi surface, for all the doping levels investigated. These results suggest that the electron-doped superconducting copper oxides are weak coupling BCS superconductors.

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L. Shan, Y. Huang, Y. L. Wang, Shiliang Li, Jun Zhao, Pengcheng Dai, Y. Z. Zhang, C. Ren, H. H. Wen. 2008-08-07. Weak coupling Bardeen-Cooper-Schrieffer suerconductivity in the Electron-Doped Cuprate Superconductors. https://doi.org/10.1103/physrevb.77.014526

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