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Substrate Influence on Dendritic Flux Instability in YBCO Thin Films

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Abstract

We have investigated the effect of substrate thermal conductivity on dendritic flux formation in thin superconducting YBa 2Cu 3 O 7−x films grown on yttrium-stabilized zirconia, SrTiO 3, MgO, and sapphire, exploiting a recently developed ultra-fast magneto-optical imaging system and its ultra-fast field ramp (3 kT/s). Dendritic flux formation triggered solely by rapid ramping of the external field is reported for the first time in YBCO on yttrium-stabilized zirconia, the substrate with the lowest thermal conductivity. For the other substrates, the dendritic instability could be generated only after introducing an artificial defect at the edge, enhancing the local induction. We find that the upper temperature threshold for the appearance of dendrites depends on the thermal conductivity of the substrate.

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Acknowledgments

The authors thank Dr. Robert Semerad for preparing samples and helpful discussions. We acknowledge a partial financial support from the Israel Science Foundation (Grant No. 164/12) and the Norwegian Research Council.

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Authors and Affiliations

  1. Department of Physics, Institute of Superconductivity and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, 5290002, Ramat-Gan, Israel

    E. Baruch-El, M. Baziljevich & Y. Yeshurun

  2. Department of Physics, University of Oslo, 0316, Oslo, Norway

    M. Baziljevich & T. H. Johansen

  3. Institute for Superconducting and Electronic Materials, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia

    T. H. Johansen

Authors
  1. E. Baruch-El
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  2. M. Baziljevich
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  3. T. H. Johansen
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  4. Y. Yeshurun
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Correspondence to E. Baruch-El.

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Baruch-El, E., Baziljevich, M., Johansen, T.H. et al. Substrate Influence on Dendritic Flux Instability in YBCO Thin Films. J Supercond Nov Magn 28, 379–382 (2015). https://doi.org/10.1007/s10948-014-2723-9

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  • DOI: https://doi.org/10.1007/s10948-014-2723-9

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