Abstract
We prepared precursor films of YbBa2Cu3O7-δ by coating SrTiO3(001) single crystal substrate with metalorganic compounds solution and by heating at 425°C. Then, microstructures of the precursor films were observed by transmission electron microscopy. The film heated rapidly up to 425°C was amorphous. On the other hand, the film heated gradually was polycrystalline. After final annealing at 725°C, the former sample showed a sharp transition of the electric resistance around critical temperature (TC). The latter one showed a broad transition. Therefore, we conclude that a high heating rate at the pre-treatment is important for achieving a sharp resistive transition of the final film.
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