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  • 1
    Electronic Resource
    Electronic Resource
    Grain growth of rapid-thermal-annealed Y-Ba-Cu oxide superconducting thin films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 435-437 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A study of the microstructure of Cu-rich and stoichiometric Y-Ba-Cu oxide thin-film superconductors is presented. The films were deposited on 〈100〉 SrTiO3 by the nonvacuum technique of metalorganic deposition followed by rapid thermal annealing in oxygen. Analysis showed that for annealing temperatures below 900 °C, grain size increased with increased annealing temperature, with an enhancement in grain growth for the Cu-rich films. Annealing near or above the melting point of the 1-2-3 phase causes only a slight increase in the rate of grain growth and no detectable effects of the excess Cu. Annealing above 920 °C produces segregated CuO islands 5–10 μm in size in the Cu-rich films. Oriented grain growth was found for the 1-2-3 grains with their c axis perpendicular and parallel to the SrTiO3 substrates. Sheet resistivity measurements were correlated with grain size, phase separation, and oriented grain growth. An anomalous behavior in the resistance-temperature plot at 220–240 K of the Cu-rich films is shown to be related to the presence of the excess Cu.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100612
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  • 2
    Electronic Resource
    Electronic Resource
    Rapid thermal annealing of high Tc superconducting thin films formed by metalorganic deposition (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1631-1633 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin-film superconductors of Y-Ba-Cu and Yb-Ba-Cu have been formed by the nonvacuum method of metalorganic deposition (MOD). The films produced in this manner were homogeneous and free of voids and cracks over large dimensions. A two-step rapid thermal annealing of the MOD films, in oxygen, at 850 °C for 60 s followed by a second annealing at 920 °C for 30 s enhanced grain growth in the films and reduced the effects of substrate interaction. Preferred epitaxial grain growth, in the high Tc films, with the c axis both perpendicular and parallel to the substrate surface, occurred on 〈100〉 SrTiO3. Both the Y-Ba-Cu and Yb-Ba-Cu films showed superconducting onset temperatures above 90 K and zero resistance at 86 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99706
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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