Tunneling Spectroscopy on c-axis Y1-xCaxBa2Cu3O7-delta Thin Films
Abstract
Scanning tunneling spectroscopy was performed on c-axis Y1-xCaxBa2Cu3O7-delta thin films for x= 0, 0.05, 0.15 and 0.20 at 4.2K. The measured spectra show main-gap, sub-gap and satellite features which scale similarly in energy versus Ca-doping, suggesting that they are associated with a single pairing energy. The data is analyzed with a multiband tunneling model which attributes the sub-gap features to the chain band and the satellite and main-gap features to the plane band for d+s pairing symmetry. These results suggest that the superconductivity in Y1-xCaxBa2Cu3O7-delta involves multiple bands.
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