Abstract
High-temperature superconducting (HTS) properties such as critical current Jc (77 K) of up to 4×106 A/cm2, microwave surface resistance, Rs (77 K and 50.8 GHz) as low as 15 mΩ and Tc(R=0) of up to 91 K have been measured for YBa2Cu3O7−x, YBCO, layers prepared by pulsed laser deposition on MgO and (11̄02) Al2O3 buffered with yttrium stabilized zirconia (YSZ). The following x-ray structural parameters have been measured: percentage of residual (200) or (103) lines, value of c-axis parameter, percentage of (111) unwanted lines in (100) YSZ buffer layers, ratio of 〈100〉 to 〈110〉 orientation in the basal plane as determined by double crystal diffraction phi-scan and full width half maximum (FWHM) of (005) rocking curve. It was found that the most critical structural parameter is the substrate quality and 100% 〈100〉 basal plane orientation of the individual grains.
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