Abstract
Recent progress in tailoring periodic step structures in vicinal SrTiO 3 single crystal substrate surfaces enable a systematic study of the interplay of growth mediated defect structures and transport properties in HTS thin films. UHV annealed (001) oriented SrTiO 3 substrates with a 10° miscut towards the [010] direction show after a UHV annealing a regular nanoscale step structure which generates an almost periodic terrace-like surface structure of the YBa 2Cu 3O 7 film. Cross-sectional as well as planar view TEM reveals an anisotropic defect structure arising from the nanoscale step structure of the substrate surface. Transport measurements and magneto-optical analysis of the flux penetration show a growth-induced in plane anisotropy and an anisotropic enhancement of the critical current up to values close to the depairing limit.
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