Forward and reverse flux creep in single crystal Tl2Ca2BaCu2Oχ superconductors

F. Zuo, M. B. Salamon, T. Datta, K. Ghiron, H. Duan, A. M. Hermann

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Abstract

We report the observation of novel flux motion in single-crystal superconducting Tl2Ca2BaCu2Oχ. Application of a field H≤1 kG following zero-field cooling results in typical logarithmic flux creep, with a peak in δM/δln t near 18 K. Above 50 K, different flux dynamics are observed: an exponential decrease in the diamagnetic moment that gives way near 70 K to the appearance of reverse creep, i.e., increasingly negative magnetization. This latter effect begins after a temperature- and field-dependent wait time. While conventional theory explains inward flux creep, we must invoke flux-line roughening, drive by pinning randomness, to give rise to reverse creep.

Original languageEnglish (US)
Pages (from-to)541-546
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume176
Issue number4-6
DOIs
StatePublished - Jun 1 1991

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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