Interpretation of the critical current in BiSrCaCuO tape conductors as parallel weak-link and strong-link paths

D.C. van der Laan, H.J.N. van Eck, H.J.N. van Eck, J. Schwartz, Bernard ten Haken, Herman H.J. ten Kate

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Abstract

To better understand the dominant mechanisms that limit the critical current density in high temperature superconductors, the dependence of the critical current density on magnetic field and temperature of Bi2Sr2Ca2Cu3Ox tapes is measured in magnetic fields up to 8 T and temperatures between 4.2 and 100 K. The results were modeled by describing the current in the tape as two parallel current paths. The critical current density of one path is limited by weak links and that of the other path by intragranular flux pinning. The temperature dependence of the parameters used in the model indicates that the weak link contribution vanishes at a temperature of 86 K. This is an indication that the weak link behavior is dominated by a remnant Bi2Sr2CaCu2Ox phase. At higher temperatures the critical current density of the tape is limited by intragranular pinning.
Original languageUndefined
Pages (from-to)1024-1027
Number of pages4
JournalPhysica C
VolumePart II
Issue numberPart 2
DOIs
Publication statusPublished - 2002

Keywords

  • Critical current
  • Weak links
  • METIS-206805
  • Strong links
  • IR-74798
  • Superconductors

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