Flux-creep dissipation in epitaxial YBa sub 2 Cu sub 3 O sub 7 minus. delta. film: Magnetic-field and electrical-current dependence

Journal Article · Fri Feb 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.2962· OSTI ID:5734686

Kim, J; Lee, H; Chung, J; Shin, H J; Lee, H J ^[1]; Ku, J K ^[2]

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1. Department of Physics, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600, Korea (KR) Physics Division, Research Institute of Industrial Science and Technology, Pohang P.O. Box 135, Kyungbuk 790-600, (Korea)
2. Department of Chemistry, Pohang Institute of Science and Technology, Pohang P.O. Box 125, Kyungbuk 790-600, (Korea) Physics Division, Research Institute of Industrial Science and Technology, Pohang P.O. Box 135, Kyungbuk 790-600, (Korea)

We have investigated the dissipation characteristics in the mixed state of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} film, grown epitaxially on the SrTiO{sub 3}(100) substrate, in terms of external transport current as well as magnetic field applied parallel to the {ital c} axis of the film. The dissipation fits well the thermally activated flux creep model, {ital R}={ital R}{sub 0} exp({minus}{ital U}/{ital k}{sub {ital B}T}), where {ital U} is a function of electrical current, magnetic field, and temperature. In the range of current density {similar to}20--4000 A/cm{sup 2}, the current dependence of the activation energy {ital U} scales with ln({ital I}/{ital I}{sub 0}), as observed recently by Zeldov {ital et} {ital al}. {ital U} shows a power-law dependence on magnetic field as {ital H}{sup {minus}{beta}} with {beta}=0.73{plus minus}0.002. We obtain the resistance prefactor {ital R}{sub 0} proportional to the applied magnetic field, provided the Ginzburg-Landau-type magnetic-field suppression of the mean-field transition temperature {ital T}{sub {ital c}0} is taken into account. In addition, we present the magnetoresistance at various temperatures below {ital T}{sub {ital c}0}, in good accordance with the flux-creep model.

• OSTI ID: 5734686
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 43:4; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ENERGY LOSSES
LOSSES
MAGNETIC FIELDS
MAGNETIC FLUX
MATHEMATICAL MODELS
MIXED STATE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES