Microwave properties of YBa$_2$Cu$_3$O$_{7-δ}$ films with BaZrO$_3$ nanoinclusions

Details Microwave properties of YBa$_2$Cu$_3$O$_{7-δ}$ films with BaZrO$_3$ nanoinclusions Microwave properties of YBa$_2$Cu$_3$O$_{7-δ}$ films with BaZrO$_3$ nanoinclusions

2006-10-23

arxiv.org/abs/cond-mat/0610628v1

Physics

Condensed Matter

Superconductivity

2 printed pages, 2 figures, proceedings of M2S (Dresden), to appear in Physica C

Scientific paper

10.1016/j.physc.2007.03.104

We present measurements of the microwave complex surface impedance at 47.7 GHz in YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) films deposited by pulsed laser deposition with the explicit goal to introduce BaZrO$_3$ (BZO) nanoinclusions. Composite targets obtained by addition of BZO powder in molar percents ranging from 2.5 to 7 mol.% 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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