Vortex dynamics in nanofabricated chemical solution deposition high-temperature superconducting films

摘要

Artificial manipulation and control of vortex dynamics in YBa2Cu3O7\ud(YBCO) films have always been a complex issue, especially since high thermal excitations\udbut also strong vortex pinning capabilities coexist in this material. Thus,\udartificial nanofabrication strategies able to generate competing effects with intrinsic\udmicrostructural defects need to be achieved. Lithography tools are widely used to create\udmodel systems with controlled pinning potentials in superconductors. However,\udthese techniques easily disturb the optimal oxygen film doping in YBCO films and\udconsequently the overall performances degrades.\udWe have optimized the use of two different high-resolution nanolithography approaches,\udFocused Ion Beam Milling and Electron Beam Lithography, to artificially\udand locally modify the pinning landscape of YBCO films grown by chemical solution\uddeposition (CSD). Three different nanofabricated systems will be discussed, which\udresulted in ideal structures to manipulate vortex dynamics in CSD-YBCO thin films\udwith strong intrinsic pinning centers. In particular, we observed artificial granularity\udeffects, nanowall pinning, and positive and negative rectification effects. We will\udreport on our understanding of all these effects and potential expectations.