Superconductor GdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} edge junctions with lattice-matched Y{sub 0.6}Pr{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} barriers
- Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
High-temperature-superconductor Josephson junctions with an edge geometry of superconductor/normal-metal/superconductor have been fabricated on yttria-stabilized zirconia substrates by engineering the electrode and {ital N}-layer material to reduce the lattice mismatches ({ital a}, {ital b}, and {ital c}). With GdBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} as electrodes and Pr-doped Y{sub 0.6}Pr{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} as a barrier, the lattice mismatches from electrode and barrier layer are reduced to a very low level. The junctions fabricated with such a design demonstrate resistively shunted junction current-voltage characteristics under dc bias at temperatures in the range of 77--88 K. The quite low specific interface resistivity on the order of 10{sup {minus}10} {Omega} cm{sup 2} indicates that the junction performance is controlled by the normal-metal (N) layer material instead of the interfaces. The use of lattice-matched electrode and N-layer material is one of the key design rules to obtain controllable high-temperature superconductor Josephson junctions. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 83910
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 78; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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