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VOLUME 50 | ISSUE 11 | PAGE 490
Energy gap in YBa2Cu3Ox determined from the data on tunnel experiments with single crystals
The tunnel spectra of YBa^Cu^O^ single crystals with various oxygen concentrations were studied using a scanning tunneling microscope in the orientations perpendicular to and parallel to the basal ab plane. Two gap-related structural features were observed in the tunnel spectra in the orientation at right angles to the ab plane. The plot of the energy gap Δ (χ) is similar to the plot of Tc{x). The distribution of Δ in the depth of the sample was found to be systematically nonuniform.

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