Effect of self-organized criticality on magnetic-flux creep in type-II superconductors: A time-delayed approach

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.1192· OSTI ID:5335272

Pan, W ^[1]; Doniach, S ^[2]

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1. Department of Physics, Stanford University, Stanford, California 94305 (United States)
2. Department of Applied Physics, Stanford University, Stanford, California 94305 (United States)

Bean's original model successfully explained the phenomenon of irreversible magnetization in type-II superconductors and revealed the threshold behavior of flux motion. The latter has similarities to the sliding of sand grains in a pile of sand, an example of self-organized criticality (SOC) initiated by P. Bak [ital et] [ital al]. However, the effect of thermal relaxation was not considered in the SOC context. We have generalized Kim and Anderson's derivation of flux creep by incorporating the effects of avalanches on the relaxation of magnetization close to the self-organized critical state using a time-delayed diffusion equation approach. We predict qualitative changes in the nature of flux creep when measured close to the critical state.

• OSTI ID: 5335272
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:2; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICALITY
IRREVERSIBLE PROCESSES
MAGNETIC FLUX
MAGNETIZATION
RELAXATION
SUPERCONDUCTORS
TIME DELAY
TYPE-II SUPERCONDUCTORS