Exact solution for flux creep with logarithmic U(j) dependence: Self-organized critical state in high-Tc superconductors

V. M. Vinokur, M. V. Feigelman, V. B. Geshkenbein

Research output: Contribution to journalArticlepeer-review

211 Citations (Scopus)

Abstract

An exact solution describing flux creep in high-Tc superconductors is found, assuming the creep activation barrier U grows logarithmically with decreasing current j: U=U0 ln(j0/j). For incomplete flux penetration, the flux density B is a function of the single variable =x/t1/(+2), =U0/T, and the system considered exhibits self-organized criticality. In a fully penetrated sample, B depends separately upon x and t. A sharp transition between these regimes occurs when the flux fronts from opposite sides of the sample meet, resulting in a kink in the magnetization relaxation curve.

Original languageEnglish
Pages (from-to)915-918
Number of pages4
JournalPhysical Review Letters
Volume67
Issue number7
DOIs
Publication statusPublished - 1991
Externally publishedYes

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