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High-quality stoichiometric films of YBa2 Cu3 O7−x have been grown epitaxially on SrTiO3 substrates by sputtering from a stoichiometric target of hemispherical shape using a Hg vapor triode plasma. Films exhibited superconducting transitions of a width ΔT∼2.5 K, with zero resistance being achieved at 89 K. From both the x rays and the temperature dependence of the normal-state electrical resistance it can be inferred that the films contain an admixture of domains with either the c or a axes normal to the plane.
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Wehner et al. (1988) studied this question.
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