I-V curves of bifilar BSCCO tapes exposed to AC magnetic field

N. Shaked, A. Friedman, M. Sinvani, F. Kopansky, Y. Wolfus, Y. Yeshurun

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations

Abstract

A study of the DC I-V curves of bifilar BSCCO/Ag tapes at 77 K is presented. Tapes under study were carrying DC transport current and exposed to external AC (0-20 mT, 50-400 Hz) or DC (0-20 mT) magnetic fields perpendicular to the plane of the tape. The measurements were carried out with bifilar tape to avoid the influence of the self-field. The measured I-V curves are well described by power law in the range of electric field 0.1-10 μV/cm. The AC field affects the I-V curves in a much stronger way than the DC field. The application of the AC field results in a linear decrease of the critical current (criterion 1 μV/cm) independent of the frequency of the magnetic field. The exponent n also exhibits a strong dependence on the AC magnetic field decreasing with increasing AC field amplitude and increasing with increasing frequency. The results are interpreted by assuming a confinement of the DC transport current in the central AC field free region of the tape. A low current density is assumed to flow in the region to which the AC magnetic field has penetrated.

Original languageEnglish
Pages (from-to)201-205
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume401
Issue number1-4
DOIs
StatePublished - 15 Jan 2004
EventProceedings of the International Cryogenic Materials Conference - Enschede, Netherlands
Duration: 25 May 200328 May 2003

Bibliographical note

Funding Information:
This research has been partially supported by the Israel Ministry of National Infrastructures, R&D Department.

Keywords

  • AC magnetic field
  • BSCCO tape
  • Critical current
  • I-V curve
  • Penetration field

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