Effect of flux avalanches on activation energy in type-II superconductors: Evidence for self-organized criticality

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.4208· OSTI ID:6073260

Wang, Z; Shi, D ^[1]

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1. 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:6; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ENERGY
HIGH-TC SUPERCONDUCTORS
MAGNETIC FLUX
NIOBIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TIN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TYPE-II SUPERCONDUCTORS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES