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Minute doping with deleterious rare earths in YBa2Cu3O7-δ films for flux pinning enhancements

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7 Author(s)
Barnes, P.N. ; Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433-7919 ; Kell, J.W. ; Harrison, B.C. ; Haugan, T.J.
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To enhance the critical current density of YBa2Cu3O7-δ films, flux pinning centers are intentionally added to inhibit flux flow in applied magnetic fields. Here we provide an initial demonstration that the incorporation of very minor additions (≤1% of Y as opposed to the 10%–40% in standard substitutions) of typically deleterious rare earths into high quality YBa2Cu3O7-δ thin films provides significant improvement of the film’s in-field current density. This is accomplished without reoptimization of the deposition parameters. Instead of site substitution for Y as might be expected, the deleterious rare earths potentially result in the formation of nanoparticulates.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 1 )

Date of Publication:

Jul 2006

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