Tunneling Spectroscopy of High Tc Oxide Superconductors with a Scanning Tunneling Microscope

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Abstract
Tunneling experiments were performed on cleaved samples of high Tc oxide superconductors. The data can be fitted by introducing a current depairing term into the BCS density of states. This demonstrates the importance of depairing mechanisms in tunneling studies of these high Tc materials. Large Δ with 2Δ/kTc as large as 11 was obtained. The gap values are different for different junctions.

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