Magnetic relaxation and critical current density limited by flux creep in Bi sub 1. 6 Pb sub 0. 4 Sr sub 1. 6 Ca sub 2 Cu sub 2. 8 O sub x ( T sub c =115 K) and YBa sub 2 Cu sub 3 O sub 7 minus x
Journal Article
·
· Physical Review (Section) B: Condensed Matter; (USA)
- Department of Metallurgical Engineering and Materials Science and Mellon Institute, Carnegie Mellon University, Pittsburgh Pennsylvania 15213 (US)
We have investigated the magnetization behavior of Bi{sub 1.6}Pb{sub 0.4}Sr{sub 1.6}Ca{sub 2}Cu{sub 2.8}O{sub {ital x}} (Bi 2:2:2:3) and YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital x}} (Y-Ba-Cu-O) as a function of field, temperature, and time. We find a logarithmic time decay in both zero-field-cooled magnetization and remanent magnetization, consistent with the Anderson-Kim flux-creep model with activation energies of {ital U}{sub 0}/k=700 K (0.06 eV) for Bi 2:2:2:3 and {ital U}{sub 0}/k=1700 K (0.15 eV) for Y-Ba-Cu-O in an applied field of 1 kOe. Measured activation energies remain essentially temperature independent for {ital T}/{ital T}{sub {ital c}} less than 0.6 while {ital J}{sub {ital c}}(T) decays rapidly as a result of the relatively small {ital U}{sub 0}.
- OSTI ID:
- 5650415
- Journal Information:
- Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:7; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Thu Feb 28 23:00:00 EST 1991
· Journal of Applied Physics; (USA)
·
OSTI ID:6000462
Two-dimensional paraconductivity in superconducting Bi sub 1. 6 Pb sub 0. 4 Sr sub 2 Ca sub 2 Cu sub 3 O sub Y
Journal Article
·
Sun Jul 15 00:00:00 EDT 1990
· Journal of Applied Physics; (USA)
·
OSTI ID:6728837
Flux pinning in Y sub 1 minus x Pr sub x Ba sub 2 Cu sub 3 O sub 7 minus. delta. high T sub c superconductors
Journal Article
·
Mon Apr 22 00:00:00 EDT 1991
· Applied Physics Letters; (USA)
·
OSTI ID:5562659
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
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIZATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RELAXATION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
LEAD COMPOUNDS
LEAD OXIDES
MAGNETIZATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RELAXATION
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES