To enhance the critical current density of YBa2Cu3O7-delta 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-delta thin films provides significant improvement of the film's in-field current density. This is accomplished ...
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