A new hybrid two-zone/crucible furnace process for the growth of epitaxial Tl2Ba2CaCu2O8 superconducting films
JOURNAL OF MATERIALS RESEARCH(1998)
摘要
Epitaxial Tl2Ba2CaCu2O8 (Tl-2212) films similar to 5500 Angstrom thick are grown on LaAlO3(100) substrates using a new hybrid two-zone/crucible furnace process enabling precise control of thallination. This method combines the best features of both conventional crucible and two-zone processing for the first time: superb film properties and reduced handling of hazardous Tl-oxide powders. Single-phase, highly c-axis oriented Tl-2212 films are grown with smooth morphology, Meissner transition similar to 103 K, and critical current density similar to 1.1 x 10(7) A/cm(2) at 5 K for twenty consecutive runs without having to change or add to the Tl-oxide source.
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关键词
epitaxy,crystal growth,transition temperature,texture,materials science,crystal structure
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