Proximity Effect in Gold Coated YBa₂Ca₃O₇₋δ Films Studied by Scanning Tunneling Spectroscopy
Sharoni, Amos · Asulin, Itay · Koren, Gad · Millo, Oded
Original · EN
Scanning tunneling spectroscopy on gold layers over-coating c-axis YBa₂Ca₃O₇₋δ (YBCO) films reveals proximity induced gap structures. The gap size reduced exponentially with distance from a-axis facets, indicating that the proximity effect is primarily due to the (100) YBCO facets. The penetration depth of superconductivity into the gold is 30 nm, in good agreement with estimations for the dirty limit. The extrapolated gap at the interface is 15 meV, consistent with recent point-contact experiments. The proximity-induced order parameter appears to have predominant s-wave symmetry.
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