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• W3105177890 startingPage "225701" @default.
• W3105177890 abstract "We evaluate the influence of thermal fluctuations on superconducting rings that enclose a magnetic flux, using the time-dependent Ginzburg--Landau (TDGL) or the Kramer--Watts-Tobin (KWT) model, while thermal fluctuations are accounted for by means of Langevin terms. This method is applicable in situations where previous methods are not, such as nonuniform loops, rings with large width to radius ratio and loops with large coherence length to perimeter ratio. We evaluate persistent currents, position and statistical behavior of flux-induced vortices and lifetime of metastable fluxoid states. The influence of nonuniformity on the persistent current does not depend strongly on the details of the cross-section profile; it depends mainly on its first harmonic, but not only on it. As a consequence of nonuniformity the maximum of the persistent current shifts to smaller fluxes and the passage between fluxoid states remains non-hysteretic down to lower temperatures than in the case of a uniform sample. Our results using TDGL agree remarkably well with recent measurements of the persistent current in superconducting rings and with measurements of the position of a vortex that mediates between fluxoid states in an asymmetric disk with a hole; they could also provide a plausible explanation for unexpectedly short measured lifetimes of metastable states. Comparison between TDGL and KWT indicates that they lead to the same results for the persistent current, whereas KWT leads to larger lifetimes than TDGL." @default.
• W3105177890 created "2020-11-23" @default.
• W3105177890 creator A5079349407 @default.
• W3105177890 date "2011-05-16" @default.
• W3105177890 modified "2023-09-25" @default.
• W3105177890 title "The influence of thermal fluctuations on uniform and nonuniform superconducting rings according to the Ginzburg–Landau and the Kramer–Watts-Tobin models" @default.
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• W3105177890 doi "https://doi.org/10.1088/0953-8984/23/22/225701" @default.
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