I-V curves of BSCCO tape carrying DC current exposed to perpendicular and parallel AC fields

A. Friedman, Y. Wolfus, F. Kopansky, I. Soshnikov, V. Roitberg, S. Asulay, B. Kalisky, Y. Yeshurun

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6 Scopus citations


A study of the DC I-V curves of BSCCO tapes exposed to AC perpendicular and parallel magnetic fields is presented. AC magnetic fields with amplitudes up to 700 G and frequencies from 1 to 430 Hz have been applied perpendicular and parallel to tapes carrying DC currents at T = 77 K. Both field orientations result in a significant DC electric field increase, in comparison to applying DC magnetic fields of the same intensity. However, the observed I-V curves behavior is different for the perpendicular and parallel cases. In the perpendicular case, we distinguish between two frequency regimes: for frequencies above 40 Hz, the observed I-V curves obey the empirical power law dependence with current density, JC, and power index, n, that strongly depend on the field amplitude. For frequencies below 20 Hz, the observed I-V curves deviate from power law description. In the parallel field case, the I-V curve can be regarded as a superposition of an additional DC voltage over the no field I-V curve. This additional voltage increases with increasing current, peaks near the critical current and decreases thereafter. The results are discussed assuming a narrowing down of the DC current path under the application of a perpendicular AC field. Shaking of the pinned vortices under the application of a parallel AC field is assumed for explaining the results in this case.

Original languageEnglish
Pages (from-to)2891-2894
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 PART III
StatePublished - Jun 2005

Bibliographical note

Funding Information:
Manuscript received October 5, 2004. This work was supported in part by the Israeli Ministry of Infrastructure. The authors are with the Institute of Superconductivity, Department of Physics, Bar-Ilan University Ramat-Gan 52900, Israel (e-mail: freidma@mail.biu.ac.il). Digital Object Identifier 10.1109/TASC.2005.848256 Fig. 1. Magnetic flux lines inside the tape for AC field magnetic field perpendicular to broad side of the tape. w is the width of the tape and b is a width of the central zone free of AC field.


  • Ac field
  • Bi-2223 tape
  • Critical current
  • I-v curve. © 2005 ieee


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