Abstract
The problems associated with developing a room-temperature superconductor are discussed with descriptions given of the most promising areas of research. The review examines the fundamental properties of elements and alloys, and the unusual properties of metal-metalloid compounds are listed with references to exotic superconductors. The prevalence of epitaxial growth in cuprates and other oxides is discussed, and it is shown that deposition parameters can be changed so that conducting CuO2 planes grow perpendicular to a film surface. Grain boundaries are important in the device performance of high-Tc materials, and 45-deg grain-boundary junctions are possible by photolithographic techniques. Grain boundaries can be developed that are not weak links, and the combination of superconducting and semiconducting devices is possible by using epitaxial buffer layers. It is suggested that the present superconducting temperature limit is a limit for the copper oxide system.
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