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

Abstract

We use in-plane tunneling spectroscopy to study the temperature dependence of the local superconducting gap $\Delta (T)$ in electron-doped copper oxides with various $T_c$'s and Ce-doping concentrations. We show that the temperature dependence of $\Delta (T)$ follows the expectation of the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity, where $\Delta (0)/k_B{T}_c\approx 1.72\pm 0.15$ and $\Delta (0)$ 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.

5 pages, 4 figures

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• Destruction of Neel order and appearance of superconductivity in electron-doped cuprates by oxygen annealing process
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• Coexistence of the antiferromagnetic and superconducting order and its effect on spin dynamics in electron-doped high-$T_c$ cuprates