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Motion of vortices in superconductors

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Abstract

A dissipation-free current can be achieved in a superconductor only when tiny magnetic vortices, which penetrate the superconductor when a magnetic field is applied, are pinned down against current-induced force. To investigate the mechanism by which such vortex pinning occurs, we have made real-time observations1 of the onset of vortex motion in high-temperature Bi2Sr2CaCu2O8+δ(Bi-2212) superconductors.

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Figure 1: Lorentz micrographs showing the motion of vortices in a Bi-2212 film when the force is exerted on vortices by changing magnetic field.
Figure 2: Lorentz micrographs showing plastic flow of vortices at the depinning threshold, T>Tt.

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Authors and Affiliations

  1. Advanced Research Laboratory, Hitachi Ltd, Hatoyama, 350-0395, Saitama, Japan

    A. Tonomura, H. Kasai, O. Kamimura, T. Matsuda & K. Harada

  2. Department of Applied Chemistry, University of Tokyo, Tokyo, 113-8656, Japan

    J. Shimoyama, K. Kishio & K. Kitazawa

  3. CREST, Japan Science and Technology Corporation (JST), Kawaguchi, 332-0012, Saitama, Japan

    A. Tonomura, K. Harada, J. Shimoyama, K. Kishio & K. Kitazawa

Authors
  1. A. Tonomura
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  2. H. Kasai
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  3. O. Kamimura
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  4. T. Matsuda
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  5. K. Harada
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  6. J. Shimoyama
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  7. K. Kishio
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  8. K. Kitazawa
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Tonomura, A., Kasai, H., Kamimura, O. et al. Motion of vortices in superconductors. Nature 397, 308–309 (1999). https://doi.org/10.1038/16826

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