Temperature and magnetic field dependence of the critical current of Bi2Sr2Ca2Cu3Ox tape

D. C. Van Der Laan, H. J.N. Van Eck, B. Ten Haken, J. Schwartz, H. H.J. Ten Kate

Research output: Contribution to journalConference article

35 Scopus citations

Abstract

In order to improve the understanding of the dominant mechanisms that limit the critical current in high temperature superconductors, the dependence of the critical current on magnetic field and temperature of a Bi2Sr2Ca2Cu3Ox tape has been investigated in detail. The critical current is measurement in magnetic fields up to 8 T, at temperatures ranging from 4.2 K to 70 K. The results are compared with existing models that describe the current path as two parallel systems, one depending on weak links and the other on flux pinning. The critical current at low magnetic fields is reduced drastically by the self-field of the superconductor. At intermediate magnetic fields, the field dependence of the critical current is mainly dominated by weak links, while at higher fields it is dominated by the strong-links current path, and depends on flux pinning. To clarify the models used to describe the measurements, the temperature dependence of the parameters used in the models is studied. The temperature dependence of the parameters used to describe the weak-links current path points out that the weak links are formed by remnant Bi2Sr2Ca1Cu2Ox phase at the grain boundaries.

Original languageEnglish (US)
Pages (from-to)3345-3348
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume11
Issue number1 III
DOIs
StatePublished - Mar 1 2001
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: Sep 17 2000Sep 22 2000

All Science Journal Classification (ASJC) codes

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

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