Effect of flux avalanches on activation energy in type-II superconductors: Evidence for self-organized criticality
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
The behavior of thermally activated flux avalanches is studied for both high-[ital T][sub [ital c]] superconductors (single crystals of Bi[sub 2]Sr[sub 2]CaCu[sub 2]O[sub [ital x]] and YBa[sub 2]Cu[sub 3]O[sub [ital x]]) and a conventional type-II superconductor (Nb[sub 3]Sn multifilamentary wire). By combining two different mechanisms, namely, thermally activated and avalanche flux motion, we have developed a [ital U]([ital j]) relationship in a large regime of driving force for type-II superconductors. As a result of flux avalanches, the flux-motion activation energy is considerably reduced. We have found a dynamic crossover at which the flux-motion characteristic changes from spatially and temporally correlated flux avalanches to slow creep.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6073260
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 48:6; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
TYPE-II SUPERCONDUCTORS
MAGNETIC FLUX
ACTIVATION ENERGY
BARIUM OXIDES
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
NIOBIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TIN COMPOUNDS
YTTRIUM OXIDES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
ENERGY
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
665411* - Basic Superconductivity Studies- (1992-)