Effects of quantum and thermal fluctuations on collective pinning and critical current density in type-II superconducting bulk materials

Ming Ju Chou, Herng-Er Horng

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The effects of quantum and thermal fluctuations on collective pinning and critical current density Jc are investigated for bulk type-II superconductors by utilizing quantum statistics. It is shown that for a constant magnetic field, Jc is nearly independent of temperature in the quantum limit; however, in the classical limit, Jc decreases weakly with increasing temperature when T < Tdp (depinning temperature); when Tdp < T < Tf (boundary fluctuation temperature), Jc is power-law-decaying, and when T > T f, Jc decays exponentially. For constant temperature, Jc first decreases, then increases after reaching a maximum, and finally decreases again. These results are in agreement with the experiments.

    Original languageEnglish
    Pages (from-to)609-618
    Number of pages10
    JournalInternational Journal of Modern Physics B
    Volume25
    Issue number4
    DOIs
    Publication statusPublished - 2011 Feb 10

    Keywords

    • Critical current density
    • collective pinning
    • vortex dynamics

    ASJC Scopus subject areas

    • Statistical and Nonlinear Physics
    • Condensed Matter Physics

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