The irreversibility line and flux creep. A comparative study of Ba-xKxBiO3-δ and YBa2Cu3O7-δ

Y. Y. Xue, Z. J. Huang, H. H. Fang, W. C. Chan, P. H. Hor, C. W. Chu, M. L. Norton, H. Y. Tang

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7 Citations (Scopus)


The relative flux creep rate S(t)≡d lnM/d ln t of a single crystal of Ba1-xKxBiO3-δ(BKBO) was measured up to a few degrees Kelvin below the irreversibility line. It is nearly constant at low temperatures but rises sharply after a threshold temperature Tt. Above Tt, the creep changes from logarithmic to non-logarithmic decay. All these are very similar to those observed in Y1Ba2Cu3O7-δ (YBCO) samples and suggest a flux-lattice phase sub-boundary. The ratio between the boundary field Bt and the irreversibility field Bi falls between 0.15 and 0.25 for both BKBO and YBCO at various temperatures, implying a possible close relationship between the boundary and the irreversibility line.

Original languageEnglish
Pages (from-to)194-202
Number of pages9
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - 1992 May 1

All Science Journal Classification (ASJC) codes

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


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