Scaling behavior of fluctuation conductivity of high-temperature superconductors in a magnetic field

Journal Article · Fri May 01 04:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.10801· OSTI ID:7043264

Kim, D H; Gray, K E; Trochet, M D ^[1]

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1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

Fluctuation conductivities of YBa{sub 2}Cu{sub 3}O{sub {ital x}} and Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}} films have been analyzed beyond the Gaussian approximation by using the two- (2D) and three-dimensional (3D) scaling functions in the critical region. Near the mean-field transition temperature {ital T}{sub {ital c}}({ital H}), the fluctuation conductivity of YBa{sub 2}Cu{sub 3}O{sub {ital x}} shows a 3D scaling behavior similar to that seen in the single crystal, suggesting that fluctuations are coherent over the adjacent Cu-O layers in this region. The fluctuation conductivity of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}} shows good agreement with 2D scaling behavior for temperatures higher than a few degrees above {ital T}{sub {ital c}}({ital H}), but a deviation occurs very near and below {ital T}{sub {ital c}}({ital H}). The poor scaling in that region may be caused by double transitions, which are systematically seen in the highly anisotropic high-{ital T}{sub {ital c}} superconductors like Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub {ital x}}, preventing the determination of the validity of a 2D scaling formula near and below {ital T}{sub {ital c}}({ital H}).

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7043264
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:18; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILMS
FLUCTUATIONS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCALING
SUPERCONDUCTING FILMS
SUPERCONDUCTORS
TEMPERATURE EFFECTS
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES