Dissipation in current-carrying high-T[sub c] superconducting ceramics in applied magnetic field
- Inst. of Physics and Technology of Materials, Bucharest (Romania)
The dissipation mechanism in high-T[sub c] superconducting ceramics was studied by analyzing the magnetic field dependence of the transport critical current and the form of the current-voltage characteristics. It was found that the actual magnetic field dependence of the transport critical current is significantly slower than that predicted by the weak-link-quenching model. The low-voltage-level current-voltage characteristics were described in terms of thermally activated flux creep at grain boundaries, taking into account collective pinning of intergranular Josephson vortices. For the investigated samples, a low-field, high-temperature mean pinning energy barrier of a few tens of meV was determined. 21 refs., 8 figs.
- OSTI ID:
- 5487289
- Journal Information:
- Journal of Superconductivity; (United States), Vol. 6:4; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CREEP
CRITICAL CURRENT
CUPRATES
DISSIPATION FACTOR
GRAIN BOUNDARIES
JOSEPHSON EFFECT
LEAD COMPOUNDS
MAGNETIC FIELDS
MAGNETIC FLUX
MATHEMATICAL MODELS
STRONTIUM COMPOUNDS
YTTRIUM COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
COPPER COMPOUNDS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
665411 - Basic Superconductivity Studies- (1992-)