A superconducting transition with an onset temperature of 52.5 K has been observed under hydrostatic pressure in compounds with nominal compositions in lanthanum-barium-copper-oxide system. In phase characterization of dysprosium barium copper oxide thin films grown on strontium titanate. A remarkable variety of structure is revealed, making clear both the possibilities and challenges for this growth technique as applied to the cuprate superconductors. The films studied are highly epitaxial. Preparation of superconducting powders.
