Abstract
Biaxially textured buffer layers and YBa 2Cu 3O 7 (YBCO) films were grown on NiO/Ni based substrates by pulsed injection MOCVD. High quality biaxially textured NiO layers have been prepared following an optimised recrystallisation–oxidation process. The yttria stabilized zirconia (YSZ) and its combination with CeO 2 and/or Y 2O 3 were investigated in the role of buffer layers for YBCO. Thin biaxially textured buffer layers were deposited in a temperature range from 600 to 800 °C. The best superconducting properties correspond to the Ni/NiO/YSZ/Y 2O 3/YBCO architecture: YBCO layers were grown epitaxially and exhibited a critical temperature T c∼90 K ( ΔT c⩽1 K) and critical current densities J c⩾5×10 5 A/cm 2 at 77 K.
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