Abstract
We present measurements of the microwave complex surface impedance at 47.7GHz in YBa2Cu3O7−δ (YBCO) films deposited by pulsed laser deposition with the explicit goal to introduce BaZrO3 (BZO) nanoinclusions. Composite targets obtained by addition of BZO powder in molar percents ranging from 2.5 to 7mol.% have been prepared and characterized. Measurements of the microwave surface impedance indicate a broadened transition in zero field, however compensated by a very large pinning frequency, indicating that while intergrain properties are still to be optimized the effect of nanometric inclusions substantially enhances the intragrain vortex pinning.
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