Size of flux jumps in superconducting films

D. V. Shantsev, A. V. Bobyl, Y. M. Galperin, T. H. Johansen, and S. I. Lee
Phys. Rev. B 72, 024541 – Published 26 July 2005

Abstract

Magneto-optical imaging is used to visualize vortex avalanches in MgB2 films at 4K. Avalanches ranging from 50 to 50 000 vortices were detected. The size distribution function has a clear peak whose position moves towards larger sizes as the applied field increases. This field dependence as well as variation of flux density profile during an avalanche is well described by a proposed model assuming a thermal origin of the avalanches. The model is based on the adiabatic approach and takes into account nonlocal electrodynamics in thin superconductors. The threshold field for thermal avalanches is predicted to be much smaller than that for thick superconductors, in agreement with the experiment.

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  • Received 11 May 2005

DOI:https://doi.org/10.1103/PhysRevB.72.024541

©2005 American Physical Society

Authors & Affiliations

D. V. Shantsev1,2, A. V. Bobyl1,2, Y. M. Galperin1,2, T. H. Johansen1,3,*, and S. I. Lee4,5

  • 1Department of Physics, University of Oslo, P.O. Box 1048, Blindern, 0316 Oslo, Norway
  • 2A. F. Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, St. Petersburg 194021, Russia
  • 3Texas Center for Superconductivity and Advanced Materials, University of Houston, Houston, Texas 77204-5002, USA
  • 4National Creative Research Initiative Center for Superconductivity, Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea
  • 5Quantum Material laboratory, Korea Basic Science Institute, 52 Yeoeun-Dong, Yusung-gu, Daejeon 305-333, Korea

  • *Electronic address: t.h.johansen@fys.uio.no

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Issue

Vol. 72, Iss. 2 — 1 July 2005

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