Critical current densities for the high temperature ceramic superconductors YBa/sub 2/Cu/sub 3/O/sub 7/ and Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10+delta/
A pulsed transport technique has been used to measure the zero field critical current densities of YBa/sub 2/Cu/sub 3/O/sub 7/ ceramic superconductors prepared under different sintering conditions. This low duty-cycle, pulsed technique, used on specially prepared samples with low resistance current contacts, allows one to determine the entire superconducting/normal phase boundary without the problems associated with sample heating. The results can be interpreted in terms of two different critical current densities. The intergrain critical current is low and is limited by the weak-links between the grains; the intrinsic intragrain critical current is greater than 10/sup 4/ A/cm/sup 2/ at 77K. Critical current values inferred from magnetic hysteresis measurements made on the same samples agree with the intrinsic intragrain critical currents obtained using the pulsed transport technique. In addition, the magnetization derived critical current density has been determined for the high T/sub c/ phase (n=3) of the Bi/sub 2/Sr/sub 2/Ca/sub n-1/Cu/sub n/O/sub 2n+4+delta/ family at 77K.
- Research Organization:
- 9506412
- OSTI ID:
- 6089810
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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GENERAL PHYSICS
36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CERAMICS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
CRITICAL CURRENT
BARIUM OXIDES
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CURRENT DENSITY
HIGH TEMPERATURE
HYSTERESIS
MAGNETIC FIELDS
MAGNETIZATION
PHASE STUDIES
STRONTIUM OXIDES
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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