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Epitaxial nanostructure and defects effective for pinning in Y(RE)Ba2Cu3O7-x coated conductors

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11 Author(s)
Yamada, Y. ; Superconductivity Research Laboratory, ISTEC, 2-4-1 Mutsuno, Atsuta-ku, Nagoya 456-8587, Japan ; Takahashi, K. ; Kobayashi, H. ; Konishi, M.
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This paper describes the microstructure to improve the magnetic field dependence of the critical current density, Jc, of Y(RE)Ba2Cu3O7-x [Y(RE)123, RE: Gd and Sm] coated conductors. A columnar microstructure 10 nm in diameter has been obtained by using Y123 targets including yttrium-stabilized zirconium for the pulsed-laser deposition. This columnar structure, composed of BaZrO3 and Y123, continued from the substrate to the surface of the film 0.25 μm in thickness. We have named it “the bamboo structure” from its morphology. The bamboo structure was effective for increasing Jc in a magnetic field especially parallel to the c-axis. We have also found stacking faults in RE123 effective to improve Jc.

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Applied Physics Letters  (Volume:87 ,  Issue: 13 )