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Effect of columnar defects on theJ c anisotropy of YBa2Cu3O7−δ thin films and YBa2Cu3O7−δ /PrBa2Cu3O7−δ multilayers

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Abstract

Epitaxial YBa2Cu3O7−δ thin films (YBCO) and YBa2Cu3O7−δ /PrBa2Cu3O7−δ multilayers (Y/Pr) were irradiated with high-energy heavy ions (770 Mev208Pb) under various directionsφ relative to thec-axis. The irradiation resulted in columnar defects tilted byφ from thec-axis. The angular dependence of their pinning activity was studied by measuring the anisotropy of the critical current density. TheJ c (B, T,ϑ) behavior of the irradiated YBCO thin films showed an additional peak, which exceeds the intrinsic pinning peak, exactly at the irradiation direction. The Y/Pr multilayers, however, showed an isotropicT c -enhancement by a factor of 5, without any additional structure in theJ c(B, T,ϑ) curve.

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Authors and Affiliations

  1. Physikalisches Institut III, Universität Erlangen-Nürnberg, Erlangen, Germany

    B. Holzapfel, M. Leghissa, P. Bauer, G. Kreiselmeyer, M. Kraus & G. Saemann-Ischenko

  2. Research Laboratories, Siemens AG, Erlangen, Germany

    B. Holzapfel & L. Schultz

  3. CIRIL, Caen, France

    S. Bouffard

Authors
  1. B. Holzapfel
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  2. M. Leghissa
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  3. P. Bauer
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  4. G. Kreiselmeyer
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  5. M. Kraus
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  6. S. Bouffard
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  7. L. Schultz
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  8. G. Saemann-Ischenko
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Holzapfel, B., Leghissa, M., Bauer, P. et al. Effect of columnar defects on theJ c anisotropy of YBa2Cu3O7−δ thin films and YBa2Cu3O7−δ /PrBa2Cu3O7−δ multilayers. J Supercond 7, 205–207 (1994). https://doi.org/10.1007/BF00730395

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  • DOI: https://doi.org/10.1007/BF00730395

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