1969
DOI: 10.1103/physrev.181.682
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Flux Creep in Type-II Superconductors

Abstract: We have made measurements of the evanescent decay of the irreversible magnetization induced by magnetic cycling of solid superconducting cylinders in order to elucidate the mechanisms of Anderson's thermally activated flux-creep process. A superconducting quantum interferometer device coupled to the creep specimen by a superconducting flux transformer made possible observations of flux changes with a resolution of one part in 10 9 . The general applicability of Anderson's theory of flux creep was confirmed and… Show more

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Cited by 773 publications
(232 citation statements)
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“…The thermal activation of flux can be suppressed by operating at a temperature lower than that used to establish the critical state [29,30] . To further improve the magnet stability, the bulk pair was maintained at 19 K, which is 1 K below the magnetizing temperature.…”
mentioning
confidence: 99%
“…The thermal activation of flux can be suppressed by operating at a temperature lower than that used to establish the critical state [29,30] . To further improve the magnet stability, the bulk pair was maintained at 19 K, which is 1 K below the magnetizing temperature.…”
mentioning
confidence: 99%
“…Large magnetic relaxation rates observed in magnetization measurements [20] are believed to arise from thermal activation of magnetic flux lines out of pinning sites. The depinning process leads to a redistribution of flux lines causing a change in magnetization with time.…”
mentioning
confidence: 99%
“…Because of its importance in limiting sustainable currents in superconducting wires and tapes, as well as in determining electromagnetic noise in superconducting thin-film devices, nonlinear magnetic vortex diffusion in type II superconductors has been widely studied for several decades [1][2][3][4][5][6]. In particular, the temporal evolution of the vortex density and the local screening current density is thought to give clues as to the thermal depinning mechanism and, more generally, on the type of magnetic flux pinning that is at the origin of the sustainable current [7,8].…”
Section: Introductionmentioning
confidence: 99%
“…In the KPZ model, diffusion is modified by the directed growth perpendicular to the interface, expressed by the term µ(∇h) 2 in Equation (1); here, this term can be considered a consequence of the vector nature of the Lorentz force on the vortices. The correlations of the stochastic noise term η(x, h; t) are assumed to be Gaussian, where η(x, h; t)η(x , h ; t ) = 2Dδ(x − x )(h − h )δ(t − t ), corresponding to uncorrelated point-like disorder.…”
Section: Introductionmentioning
confidence: 99%