Ac susceptibility of a coated conductor with high-temperature superconducting film and covered copper stabilizer

D. X. Chen

    Research output: Contribution to journalArticleResearchpeer-review

    5 Citations (Scopus)

    Abstract

    The ac susceptibility, χ=χ′-j χ″, of a nearly square sample, cut from a coated conductor tape consisting of a high-temperature superconducting film and a covered copper stabilizer, is measured as a function of temperature, T, at several values of frequency, f. It is found that the χ(f) at T>Tc can be well simulated by a modeling eddy-current susceptibility of the stabilizer, and there is an extra low-T stage, where χ is not constant as expected and may be separated into two parts. The T-independent part is contributed by Meissner currents in the film with over-low |χ′|, indicating that the film edge was damaged by cutting during tape and sample preparation. The T-dependent part is contributed by both eddy-currents and supercurrents, having a special f dependence with unknown mechanism. Both currents are interacted to each other in a complex way in the T range below and near Tc, resulting in interesting features in χ(T,f). © 2014 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)47-52
    JournalPhysica C: Superconductivity and its Applications
    Volume502
    DOIs
    Publication statusPublished - 15 Jul 2014

    Keywords

    • Ac susceptibility
    • Eddy-currents
    • Superconducting film

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