Abstract
Superconducting YBa 2Cu 3O 7 (YBCO) thin films were prepared by different deposition techniques (magnetron sputtering, laser ablation) on CeO 2 buffered r-sapphire substrates. A zero magnetic field microwave absorption measurement was used to characterize the transition of the YBCO films to the superconducting state. The obtained results were compared with the crystallographic properties (Δ ω values, morphology) of the substrates, CeO 2 buffer layers and finally with the YBCO films. Especially, we discuss about the influence of the deposition and annealing of the CeO 2 layers on the electrical properties of the YBCO films. Using rocking curve measurements, AFM and TEM analyses there were revealed structural differences in the CeO 2 layer which affect the superconducting behaviour of the YBCO films. We optimized the technological processes of the CeO 2 preparation to enhance the quality of YBCO films.
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