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Highly oriented films of YBa2Cu3O7‐x have been reproducibly prepared with the correct metal stoichiometry by dc magnetron sputtering from a single target of stoichiometric composition. To circumvent the resputtering effects, the magnetron used an unbalanced magnetic field configuration to direct the plasma away from the substrate. Typical films have sharp superconducting transitions with Tc up to 93 K and △TC(90%.‐10%.)=0.5 K, metallic resistivity above the transition with ρ300/ρ100=2‐4, and Jc>1.5xl06 A cm‐2 at 4.2 K. The temperature dependence of J,. obeys the flux creep model with activation energy U(0)=75 meV.
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