Anisotropic c-axis pinning in interfacial self-assembled nanostructured trifluoracetate-YBa_2Cu_3O_(7-x) films

摘要

An all chemical route has been used to produce substrates-nanostructured by self-assembled oxide nanoislands-and to grow YBa_2Cu_3O_(7-x) (YBCO) films on top. A great increase in the superconducting properties has been observed at high temperatures and magnetic fields parallel to the YBa_2Cu_3O_(7-x) c-axis. The vortex pinning properties and the defects induced in the YBa_2Cu_3O_(7-x) matrix have been investigated. We show that extended defects along the c-axis, induced in the YBCO matrix by the interfacial nanostructures, lay at the origin of the improved performances.