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Fe Substituted, Laser Ablated YBa2Cu3O7 films using Off-Stoichiometric Targets

  • Frank Bridges (a1) (a2), J. Truher (a1), D. K. Fork (a2) (a3), J. B. Boyce (a2), D. B. Fenner (a2) (a4), G. A. N. Connell (a2), T. H. Geballe (a3), S. Johnson (a5) and L. Liu (a5)...

Abstract

We present data on thin films of YBa2Cu3O7 (YBCO) and YBa2(Cu1−xFex)3O7 prepared by laser ablation using a sequence of targets, including Cu-deficient YBa2Cu2.4O7, CuO, and (CuO)1−y(FeO)y. This technique achieves mixing on an atomic scale. We find that stochiometric films, made using a combination of the Cudeficient target and CuO, have a sharp transition (width < 1K) near 90K although the Cu-deficient material alone has a broad transition at a lower Tc. We have achieved substitution of Fe on the Cu sites, using a sequence of the three targets for a range of Fe concentrations. Tc decreases nearly linearly with concentration and Tc → 0 near 15% Fe. The Tc suppression for the films is slightly less than the corresponding value obtained for bulk samples.

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