Reproducibility of transition temperature and critical current density of thin films of YBa2Cu3O7 on (100) LaAlO3 |
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Authors: | A. Mogro-Campero and L. G. Turner |
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Affiliation: | (1) GE Research and Development Center, 12301 Schenectady, New York |
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Abstract: | Submicrometer epitaxial films of YBa2Cu3O7(YBCO) on (100) LaAlO3 were made by coevaporation and furnace annealing. Samples from more than a dozen runs are used in this study. The zero resistance transition temperature (Tc) is high (89 or 90 K) if the film composition is phase pure (Ba/Y=2, Cu/Y=3) or if it is enriched in Ba and Cu. For these compositions the critical current density (Jc) at 77 K has an average value of 2×105 A cm–2, with a tendency for decreasingJc with increasing film thickness (0.2 to 0.8 m). Variations inJc are not correlated with deviations from ideal stoichiometry. Steeper slopes of the resistance-temperature curves above 100 K and lower values of the room-temperature resistivity are associated with high values ofJc. If the film composition is enriched in Y relative to Ba and Cu,Tc decreases by several degrees. |
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Keywords: | Superconducting films YBa2Cu3O7 critical current LaAlO3 |
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