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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/

Conference · · IEEE Trans. Magn.; (United States)
OSTI ID:6089810
; ; ; ;

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), Journal Name: IEEE Trans. Magn.; (United States) Vol. 25:2; ISSN IEMGA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
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360204 -- Ceramics
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656100 -- Condensed Matter Physics-- Superconductivity
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
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CERAMICS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
HIGH TEMPERATURE
HYSTERESIS
MAGNETIC FIELDS
MAGNETIZATION
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
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