Temperature- and field-dependent I-V characteristics of an Ag/YBa sub 2 Cu sub 3 O sub 7 minus. delta. fiber

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10508· OSTI ID:5592070

Tiernan, W M; Hallock, R B ^[1]

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1. Laboratory for Low Temperature Physics, Department of Physics Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (US)

Temperature- and magnetic-field-dependent superconducting {ital I}-{ital V} characteristics of polycrystalline Ag/YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} for current densities up to 2{times}10{sup 4} A/cm{sup 2} were investigated by means of measurements on a fiber made by the polymer-metal-complex precursor method. Data taken for {ital H}=0.5 G at selected temperatures from 4.3 to 85.7 K show significant changes in {ital I}-{ital V} characteristics between 85.7 and 60.8 K. Data for 0.5 G {le}{ital H}{le}9000 G and {ital T}=77.0 K exhibit a variety of field- and current-dependent behavior, all of which is consistent with a system of weakly coupled superconducting grains. At low current levels, power-law {ital I}-{ital V} characteristics were observed for the entire range of fields, whereas at higher current levels and for {ital H}{ge}9 G, a crossover from power law to linear {ital I}-{ital V} behavior was seen. The {ital I}-{ital V} behavior for {ital H}{approx gt}9 G is dominated by intergranular flux motion; field-dependent changes at {ital H}{approx}60 G suggest changes in intergranular flux flow related to single-grain lower critical fields.

• OSTI ID: 5592070
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FIBERS
GRAIN BOUNDARIES
GRAIN GROWTH
HIGH-TC SUPERCONDUCTORS
LOW TEMPERATURE
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
SILVER ADDITIONS
SILVER ALLOYS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES