Abstract
We have studied the superconducting and structural properties of YBCO thin films and YBCO/STO/YBCO trilayers deposited on (100) SrTiO3 substrates by off-axis PLD technique. The as-obtainedc-axis oriented YBCO films show an excellent surface free of droplets or other irregularities as well as good structural and superconducting properties with Tc (R=0)=89 K, Jc=3×106 A/cm2 (at 77 K and zero magnetic field) and the Full Width at Half Maximum (FWHM) of the (005) YBCO rocking curve of about 0.2°. These structural and electrical properties are very close to those of the YBCO films deposited by the conventional PLD on-axis geometry. The TEM cross-sectional image shows that the YBCO/STO/YBCO heterostructure has smooth interfaces and no short-circuits or pinholes were observed. The electron diffraction analysis has revealed that both YBCO top and bottom layer as well as STO interlayer are epitaxially grown withc-axis perpendicular to the substrate.
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