Surface impedance of YBa{sub 2}Cu{sub 3}O{sub 7}/Y{sub 0.6}Pr{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub 7} bilayers: Possible evidence for the proximity effect
Journal Article
·
· Physical Review, B: Condensed Matter
- Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111 (United States)
Measurements of the surface impedance of superconductor/normal-metal bilayers provide information on the proximity coupling between superconductors with different transition temperatures. Surface im- pedance data on {ital c}-axis YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}/Y{sub 0.6}Pr{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub 7} bilayers is consistent with either proximity coupling in the {ital c} direction between the two materials with a very weak proximity-induced condensate and/or the behavior of two isolated superconductors in a bilayer geometry. At least one of the characteristics of proximity coupled superconductors, namely, a strong downturn of the effective penetration depth above the lower of the two transition temperatures, was not observed in the {ital c}-axis high-{ital T}{sub {ital c}} bilayer films studied. However, the increase of the surface resistance above the {ital T}{sub {ital c}} of the Pr-doped layer is a sign that the conductivity of the Y{sub 0.6}Pr{sub 0.4}Ba{sub 2}Cu{sub 3}O{sub 7} layer is strongly enhanced above its {ital T}{sub {ital c}}, in agreement with THz spectroscopy measurements. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 397630
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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