Evaluation of grain-coupling strength of YBaCuO superconductors by their magnetic-field profile measurements
In order to evaluate the strength of intergrain coupling, which determines the transport critical-current of polycrystalline oxide superconductors, the authors have studied the relation between the transport critical-current and the spatial distribution of the magnetic flux density for YBaCuO thin films as well as bulk superconductors. They have measured the profile of the magnetic flux trapped inside bulk YBaCuO samples with a small Hall magnetic sensor, and revealed the correlation between critical current densities and the slope of the trapped-flux profile, as can be described by the critical state model. The measurement of the magnetic-field penetration depth of YBaCuO thin films in a Meissner state is also carried out by measuring of the loop inductance of a dc SQUID which is place don the YBaCuO thin film to be measured. Observed magnetic-field penetration depths of polycrystalline films with thickness of 1-3..mu..m deposited on MgO single-crystal substrates amount to --1..mu..m for samples with T/sub c'end/--80K and the critical current density j/sub c/--10'A/cm/sup 2/ at 4.2K.
- Research Organization:
- 3655500
- OSTI ID:
- 5916892
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
COUPLING
CRITICAL CURRENT
CRYSTAL STRUCTURE
CRYSTALS
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
EVALUATION
FILMS
FLUXMETERS
GRAIN BOUNDARIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC FIELDS
MEASURING INSTRUMENTS
MICROSTRUCTURE
MICROWAVE EQUIPMENT
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYCRYSTALS
SQUID DEVICES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING FILMS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES