Superconducting transport properties of epitaxial YBa sub 2 Cu sub 3 O sub 7 minus. delta. thin films: A consistent description based on thermally-activated flux motion

Journal Article · Tue Sep 01 00:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.5576· OSTI ID:7082200

Zhu, S ^[1]; Christen, D K; Klabunde, C E ^[2]; Thompson, J R ^[3]; Jones, E C ^[1]; Feenstra, R; Lowndes, D H; Norton, D P ^[2]

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1. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States)
2. Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, Tennessee 37831-6061 (United States)
3. Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 (United States) Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, Tennessee 37831-6061 (United States)

The electrical-transport current properties of a series of epitaxial YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} thin films have been investigated using a range of techniques, including the activated electrical resistivity for fields {ital B}{gt}{ital B}{sub irr}, the irreversibility field; the {ital I}-{ital V} curves for both {ital B}{gt}{ital B}{sub irr} and {ital B}{lt}{ital B}{sub irr}; and the resistive transitions in magnetic fields. The results are analyzed in the framework of a model for thermally-activated flux motion. The model utilizes a pinning barrier that is dependent on the current density {ital J}, temperature {ital T}, and applied magnetic field {ital B}, given by {ital U}{sub 0}{proportional to}exp({minus}{ital J}/{ital J}{sub {ital c}0})(1{minus}{ital t}){sup {ital n}}/{ital B}, with {ital n}{similar to}1.8. The exponential {ital J} dependence agrees well with the behavior {ital U}{proportional to}{ital J}{sup {minus}{mu}} ({mu}{similar to}0.8) of the collective-flux-creep model in the regime {ital J}{lt}{ital J}{sub {ital c}0}, while properly describing the finite pinning potential observed in the activated-flux-flow regime as {ital J}{r arrow}0. The resulting analysis using this form for {ital U}{sub 0} provides a quantitatively self-consistent interpretation of all sets of measurements.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7082200
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 46:9; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
SUPERCONDUCTING FILMS
ELECTRIC CONDUCTIVITY
BARIUM OXIDES
COPPER OXIDES
EPITAXY
MAGNETIC FIELDS
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
FILMS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)