Abstract
YBCO films with different levels of excess yttrium were prepared on single-crystalLaAlO3 with metal–organic deposition using trifluoroacetates (TFA-MOD). X-ray diffraction and transmissionelectron microscope measurements revealed excess yttrium in YBCO in the form of nanoscaleY2O3 with (400) preferred orientation. The field dependence ofJc demonstrated thatYBCO films with Y2O3 doping had enhanced Jc in comparison with stoichiometric YBCO films in the magnetic fields. We think the reason for this is thatthe Y2O3 nanoparticles act as pinning centres. YBCO films with 60% yttrium excess display 43% increasedJc compared to stoichiometric YBCO films at a magnetic field of 1 T.
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