Direction of tunneling in Pb/{ital I}/YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} tunnel junctions
- Department of Physics, University of California, San Diego, La Jolla, California 92093-0319 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Pb/{ital I}/YBCO tunnel junctions have been fabricated on {open_quote}{open_quote}{ital ab} edge{close_quote}{close_quote} surfaces of YBCO single crystals (the {open_quote}{open_quote}{ital ab} edge{close_quote}{close_quote} surface is parallel to {ital c} axis and normal to {ital a} or {ital b} axis). The characteristics of these {ital ab} junctions were compared to those of {ital c}-axis junctions. In addition, STM studies were carried out on {ital c}-axis YBCO surfaces (studying exposed {ital ab} planes). We conclude from the combined results that the tunneling current in our previously studied {ital c}-axis junctions is along the {ital c} direction and is the result of {ital c}-axis coupling. {ital c}-axis Josephson coupling between a conventional superconductor and YBCO provides strong evidence for the existence of an {ital s}-wave component in the YBCO order parameter. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 383265
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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