Abstract
We investigated the effects of oxygen redistribution on the temperature dependence of the critical current Ic(T) in YBa2Cu3O7−δ thin films. In order to induce a very slow “motion” of oxygen in the sample, we performed careful annealing of the films in argon at 175 °C. A gradual transformation of Ic(T) into a Ginzburg–Landau-like dependence of the form Ic(T)=Ico(1−T∕Tc)3∕2 is observed, implying that the superconducting film is being transformed into a percolative (filamentary) state upon annealing.
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