科研之友
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摘要
We investigate the pinning strength in YBa2Cu3O7-x films with BaZrO3 nanoinclusions. We use microwave (47 GHz) currents to induce vortex shaking and we measure the magnetic field dependent complex surface impedance. To clarify the role of different engineered pinning centers on the vortex dynamics, we investigated different YBa2Cu3O7-x/BaZrO3 films: 1) films grown by Pulsed Laser Deposition on single crystal substrates, where the inclusions give rise to elongated nanorods; 2) films grown by metallorganic deposition, where the inclusions give rise to nanospheroids; and finally 3) films grown on metallic buffered substrates, of great importance for the development of coated conductors. Using a dielectric resonator technique, we obtained data for the complex resistivity as a function of moderate dc fields up to mu H-0 = 0.8 T. We focused the analysis on the vortex pinning parameter r(H). In laser-ablated samples on single-crystal substrates we observe a change of pinning regime wi
- 出版日期2015-6
