2007/03/31 by L. Shan, Y. Huang, Yaobo Huang +10
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.77.014526
published as Physical Review B 77,014526(2008) · 5 pages, 4 figures
openalex publication_date 2008/01/28 · arxiv created 2008/08/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We use in-plane tunneling spectroscopy to study the temperature dependence of the local superconducting gap \ensuremathΔ(T) in electron-doped copper oxides with various Tc's and Ce-doping concentrations. We show that the temperature dependence of \ensuremathΔ(T) follows the expectation of the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity, where \ensuremathΔ(0)∕kBTc\ensuremath≈1.72\ifmmode±\else\textpm\fi0.15 and \ensuremathΔ(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.