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Threshold Field for Runaway Instability of Bilayer Hard Type-II Superconductor

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Abstract

We have solved the problem of the critical state stability of a bilayer type-II superconductor, whose layers have different physical properties (critical current density, specific heat, and critical temperature). We have found the optimal thickness for the outer layer, which results in a maximal increase in the stability threshold—the magnetic field at which the first thermomagnetic avalanche occurs (the jump of the magnetic flux and other physical properties). The calculations were performed for a Nb\(_3\)Sn superconductor coated with a layer of NbTi. It is shown that by choosing the optimum coating thickness, the stability threshold of the magnetic field increases by more than 60 %.

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Acknowledgments

This work was partially supported by SEP-CONACYT (Mexico) under Grant CB-2012-01-183673.

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Authors and Affiliations

  1. A. Galkin Donetsk Institute for Physics and Engineering, NASU, Ul. R. Luxemburg, 72, Donetsk, 83114, Ukraine

    O. M. Chumak, V. V. Chabanenko & S. V. Vasiliev

  2. Donetsk National University, 24 Universitetskaya str., Donetsk, 83055, Ukraine

    V. F. Rusakov

  3. Instituto de Fisica, Benemérita Universidad Autónoma de Puebla, Apdo. Post. J-48, Puebla, Pue. 72570, Mexico

    V. V. Chabanenko & F. Pérez-Rodríguez

  4. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668, Warsaw, Poland

    A. Nabiałek

Authors
  1. O. M. Chumak
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  2. V. V. Chabanenko
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  3. V. F. Rusakov
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  4. S. V. Vasiliev
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  5. F. Pérez-Rodríguez
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  6. A. Nabiałek
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Correspondence to V. V. Chabanenko.

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Chumak, O.M., Chabanenko, V.V., Rusakov, V.F. et al. Threshold Field for Runaway Instability of Bilayer Hard Type-II Superconductor. J Low Temp Phys 179, 75–82 (2015). https://doi.org/10.1007/s10909-014-1230-5

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  • DOI: https://doi.org/10.1007/s10909-014-1230-5

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