The superconductor proximity effect in Au-YBa2Cu 3O7-δ bilayer films: The role of order parameter anisotropy

O. Millo*, I. Asulin, A. Sharoni, O. Yuli, G. Koren

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Scanning tunneling spectroscopy of Au-YBa2Cu3O 7-δ bilayers reveals proximity effect features that reflect the anisotropic dx2-y2-wave order parameter in YBa2Cu3O 7-δ (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 ∼30 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.

Original languageAmerican English
Pages (from-to)539-542
Number of pages4
JournalMicroelectronics Journal
Volume36
Issue number3-6
DOIs
StatePublished - Mar 2005

Keywords

  • High temperature superconductors
  • Proximity effect
  • Scanning tunneling microscopy
  • Tunneling spectroscopy

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