Abstract
Scanning tunneling spectroscopy on gold layers overcoating [Formula presented]-axis [Formula presented] (YBCO) films reveals proximity-induced gap structures. The gap size reduces exponentially with the distance from [Formula presented]-axis facets, indicating that the proximity effect is primarily due to the (100) YBCO facets. The penetration depth of superconductivity into the gold is [Formula presented], in good agreement with estimations for the dirty limit. The extrapolated gap at the interface is [Formula presented], similar to the value of an [Formula presented]-wave component of the order parameter measured at the YBCO surface in recent point-contact experiments.
| Original language | American English |
|---|---|
| Pages (from-to) | 4 |
| Number of pages | 1 |
| Journal | Physical Review Letters |
| Volume | 92 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2004 |
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