Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9671955 | Microelectronics Journal | 2005 | 4 Pages |
Abstract
Scanning tunneling spectroscopy of Au-YBa2Cu3O7âδ bilayers reveals proximity effect features that reflect the anisotropic dx2ây2-wave order parameter in YBa2Cu3O7âδ (YBCO). No proximity effect takes place at the (001)YBCO-Au interface, manifesting the quasi two-dimensional nature of the order parameter. Proximity gaps are induced in the gold primarily via (100)YBCO facets, and their size decays exponentially on a scale of â¼30 nm, in good agreement with estimations for the dirty limit. In the nodal (110)YBCO-Au interface, the proximity effect manifests itself by the penetration of Andreev bound states into the gold. The corresponding zero bias conductance peaks are nearly constant in magnitude for Au layers thinner than 7 nm, and then decay abruptly with Au thickness, vanishing above 10 nm, on the scale of the (ballistic) mean free path.
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Authors
O. Millo, I. Asulin, A. Sharoni, O. Yuli, G. Koren,