1 March 1991 Optimizing the structural and electrical properties of Ba2YCu3O7-delta
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Abstract
We have optimized the properties of Ba2YCu3O7 (BYCO) ifims grown by co-evaporation of Y, Cu, and BaF2 followed by a two stage anneal. We find that control of the stoichiometry of the film to 1% is critical to the optimization of both structural and electrical properties. The temperature and time of the high temperature annealing stage are vital to the optimization of the crystallinity and morphology of the ifim; deviations of as little as 25°C can have profound effects on both. The low temperature annealing stage parameters are important for the oxygenation of the film, and hence its superconducting properties. Using our optimized annealing conditions on 100 nm films of correct stoichiometry grown on LaAlO3(001), we obtain Tc(RO)=9OK AT(10-90%)0.5K, and J(77K)1<106Ncm2 in essentially zero magnetic field. The morphology of these films is smooth, and the crystallinity is excellent as measured by Rutherford backscattering/channeling 1 %).
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Julia M. Phillips, Julia M. Phillips, Michael P. Siegal, Michael P. Siegal, "Optimizing the structural and electrical properties of Ba2YCu3O7-delta", Proc. SPIE 1394, Progress In High-Temperature Superconducting Transistors and Other Devices, (1 March 1991); doi: 10.1117/12.25745; https://doi.org/10.1117/12.25745
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