Preparation of superconducting thin films of calcium strontium bismuth copper oxides by coevaporation

Rice, C. E.; Levi, A. F. J.; Fleming, R. M.; Marsh, P.; Baldwin, K. W.; Anzlowar, M.; White, A. E.; Short, K. T.; Nakahara, S.; Stormer, H. L.
May 1988
Applied Physics Letters;5/23/1988, Vol. 52 Issue 21, p1828
Academic Journal
Superconducting films of Ca-Sr-Bi-Cu oxides have been prepared by coevaporation of CaF2, SrF2, Bi, and Cu, followed by post-oxidation in wet O2. The films were characterized by four-probe resistivity measurements, Rutherford backscattering, transmission electron microscopy, x-ray diffraction, and Hall measurements. Zero resistance was achieved at ∼80 K, although evidence of traces of superconductivity at higher temperatures was seen in resistivity and Hall data. The critical current at 4.2 K was 1.0×106 A cm-2. The films were epitaxial on <100> and <110> SrTiO3 substrates. The electrical and structural properties of the films were insensitive to film composition over a wide range of stoichiometries.


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