Vortex correlations in the superconducting transition of YBa[sub 2](Cu[sub 1[minus][ital x]]Al[sub [ital x]])[sub 3]O[sub 7[minus][delta]] films in high magnetic fields

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.7742· OSTI ID:6238554

Xenikos, D G; Kim, J; Lemberger, T R ^[1]

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1. Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)

We determine the characteristic length scale for vortex correlations in YBa[sub 2](Cu[sub 1[minus][ital x]]Al[sub [ital x]])[sub 3]O[sub 7[minus][delta]] films [0[le][ital x][le]0.03] by studying their current-voltage characteristics in fields 0.5 T[le][ital B][le]6 T. We find that critical scaling persists over 60% of the resistive transition (which widens from 3 to 30 K as doping concentration and field increase) and breaks down when the correlation length is 500--1250 A, a value that [ital does] [ital not] depend on the intervortex spacing. This result suggests that pinning in as-made films of YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] is dominated by extended rather than microscopic defects.

• DOE Contract Number: FG02-90ER45427
• OSTI ID: 6238554
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 48:10; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
VORTICES
BARIUM OXIDES
COPPER OXIDES
YTTRIUM OXIDES
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
SUPERCONDUCTING FILMS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
FILMS
OXIDES
OXYGEN COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)