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Improved Critical Current Densities in YBa2Cu3O7−δ Multilayer Films Interspaced with Palladium Nano-dots

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Abstract

Power applications of superconducting coated conductors in high magnetic fields require thick films with high critical current density J c and strong artificial pinning centers. Here, we report on the artificial pinning centers induced in YBCO quasi-multilayer films interspaced with palladium (Pd) nano-dots. Quasi-multilayered (QM) YBa2Cu3O7−δ (YBCO) films composed of YBCO layers interspaced with quasi-layers of palladium nano-dots were grown by pulsed laser deposition on SrTiO3(100) substrates. DC magnetization and frequency-dependent measurements showed high J c comparable with best YBCO films in thin quasi-multilayers and significant improvement of J c in thick quasi-multilayers. TEM study shows regions of planar defects, stacking faults, and pore formations suitable for immobilizing vortices. These defects significantly contribute to the pinning of magnetic flux and increase critical current in the films.

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Authors and Affiliations

  1. School of Metallurgy and Materials, University of Birmingham, Birmingham, B15 2TT, UK

    A. Sarkar, P. Mikheenko, V. S. Dang, M. M. Awang Kechik, J. S. Abell & A. Crisan

  2. National Institute of Materials Physics, Bucharest, 077125, Romania

    A. Crisan

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  1. A. Sarkar
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  2. P. Mikheenko
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  3. V. S. Dang
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  4. M. M. Awang Kechik
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  5. J. S. Abell
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  6. A. Crisan
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Correspondence to A. Sarkar.

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Sarkar, A., Mikheenko, P., Dang, V.S. et al. Improved Critical Current Densities in YBa2Cu3O7−δ Multilayer Films Interspaced with Palladium Nano-dots. J Supercond Nov Magn 24, 173–177 (2011). https://doi.org/10.1007/s10948-010-0914-6

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  • DOI: https://doi.org/10.1007/s10948-010-0914-6

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