Anisotropy of the penetration depth in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta} }: Josephson-tunneling studies
- Department of Physics, University of California, San Diego, La Jolla, California 92093-0319 (United States)
The modulation of the Josephson critical current between two superconductors in a magnetic field provides a direct, low-field dc measurement of the penetration depth of the two superconductors. To measure the in-plane penetration depth anisotropy of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, we have fabricated low leakage Pb/Insulator/YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} tunnel junctions on detwinned YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} single crystals with tunneling along the {ital c} axis. By applying the magnetic field along the {ital b} and {ital a} crystalline axes of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, {lambda}{sub {ital a}} and {lambda}{sub {ital b}} are extracted from the respective field modulation patterns. We find a large anisotropy [({lambda}{sub {ital a}}/{lambda}{sub {ital b}}){sup 2}{ge}2] of the penetration depths along the {ital a} and {ital b} axes.
- DOE Contract Number:
- FG03-86ER45230
- OSTI ID:
- 147764
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 22 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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