Effective activation energy in the Bi-Sr-Ca-Cu-O systems

Conference · Sat Aug 01 00:00:00 EDT 1992

OSTI ID:6906431

Sengupta, S; Shi, D; Wang, Z; Smith, M ^[1]; McGinn, P J ^[2]

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1. Argonne National Lab., IL (United States)
2. Notre Dame Univ., IN (United States). Dept. of Electrical Engineering

Magnetic relaxation in the Bi-Sr-Ca-Cu-O systems has been investigated in a wide temperature regime. Previously reported studies of the effective activation energy, U, have been controversial in terms of temperature and field dependence of the critical current density, j[sub c]. We have considered the temperature dependence of j[sub c] and constructed the U-j (or M) curves for the Bi-Sr-Ca-Cu-O system. We found that at a constant driving force and temperature, U is considerably higher for 2245 samples than for 2223 samples. This enhancement can be attributed to the flux pinning from finely dispersed calcium- and copper- rich precipitates.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38; FG02-90ER45427
• OSTI ID: 6906431
• Report Number(s): ANL/CP-77481; CONF-920802-36; ON: DE93002996
• Resource Relation: Conference: Applied superconductivity conference, Chicago, IL (United States), 23-28 Aug 1992
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CRITICAL CURRENT
RELAXATION
CALCIUM OXIDES
COPPER OXIDES
STRONTIUM OXIDES
ACTIVATION ENERGY
CURRENT DENSITY
HYSTERESIS
MAGNETIC FLUX
MAGNETIZATION
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CURRENTS
ELECTRIC CURRENTS
ENERGY
OXIDES
OXYGEN COMPOUNDS
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)