Measurements of the temperature dependence of the magnetic penetration depth in YBa sub 2 Cu sub 3 O sub 7 minus. delta. superconducting thin films
- Department of Applied Physics, Stanford University, Stanford, California (USA)
Using a very sensitive microstrip-resonator technique, we have measured {lambda}({ital T}) of {ital c}-axis YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} films on various substrates and compared the results to similar data on Nb and NbCN films. For YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, {lambda}({ital T}) is found to be exponential and not power law in its temperature dependence (for {ital T}{lt}{ital T}{sub {ital c}}/2) in the best films. Overall the data cannot be described by a single-gap BCS temperature dependence. The data at low temperature provide a lower limit of 2{Delta}(0)/{ital k}{sub {ital B}T{ital c}}{approx}2.5 for the minimum gap in Yba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}, yet show strong-coupling-like behavior at high temperatures. We discuss our results in the context of other experiments on the cuprate superconductors.
- OSTI ID:
- 6188050
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:17; ISSN PRBMD; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
665411 -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
FILMS
HIGH-TC SUPERCONDUCTORS
MEASURING METHODS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
QUATERNARY COMPOUNDS
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES