Summary
Superconducting thin films of the TlBaCaCuO family have been prepared through a combined approach of MOCVD and thallium vapour diffusion. A three-step process has been adopted involving i) the synthesis of Ba−Ca−Cu−O films by MOCVD using «second-generation» barium and calcium sources, ii) the hydrolysis of the fluoride phases by annealing in water vapour-saturated oxygen and iii) the annealing in the presence of a thallium source. Reproducible results, in terms of phase formation, are discussed depending on the different conditions of the preannealing process. The superconducting films consist predominantly of single-phase Tl2Ba2Ca2Cu3O x (2223). Preferential orientation of the crystallitec-axes perpendicular to the substrate surface has been observed. The films exhibit superconducting onset temperatures of 115–120 K with zero resistance higher than 100 K.
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G. Malandrino, I. L. Fragalà et al.: manuscript in preparation.
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Malandrino, G., Condorelli, G.G., Fragalà, I.L. et al. TlBaCaCuO superconducting thin films via metal-organic chemical vapour deposition (MOCVD) and thallium vapour diffusion. Nouv Cim D 16, 1953–1959 (1994). https://doi.org/10.1007/BF02471851
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DOI: https://doi.org/10.1007/BF02471851