Nature of the Josephson barrier in electron-beam-written YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} junctions
Journal Article
·
· Physical Review, B: Condensed Matter
- Physics Department, University of Wisconsin-Madison, Wisconsin 53706 (United States)
- Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Wisconsin 53706 (United States)
- Department of Materials Science and Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030 (United States)
We analyze the temperature (T) dependence of the normal-state resistance R{sub n} and critical current I{sub c} in field-emission-gun electron-beam-written YBa{sub 2}Cu{sub 2}O{sub 7{minus}{delta}} Josephson junctions from the electrode transition temperature (T{sub c}) to 1.5 K. From a theoretical fit to I{sub c}(T) and R{sub n}(T) we find that the Josephson barrier exhibits properties of a small Fermi-surface area, dirty normal metal near its maximum metallic resistivity. Within conventional superconductor-normal-superconductor theory the barrier is 3.5 mean-free-paths long at T{sub c}, with a normal-metal coherence length at T{sub c} intermediate between the clean and dirty limits. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544907
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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