The Microstructure of High-Critical Current Superconducting Films

The microstructure of superconducting films that have shown high-critical current densities has been studied. The films are shown to be epitaxial and contain twins and precipitates. The main difference between these films and low current carrying samples is the absence of grain boundaries. These bou...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 1987-10, Vol.238 (4825), p.342-344
Hauptverfasser:	Chaudhari, P., LeGoues, F. K., Segmüller, Armin
Format:	Artikel
Sprache:	eng
Schlagworte:	360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies 360204 - Ceramics, Cermets, & Refractories- Physical Properties 656100 - Condensed Matter Physics- Superconductivity ALKALINE EARTH METAL COMPOUNDS ANNEALING BARIUM COMPOUNDS BARIUM OXIDES CERAMICS CHALCOGENIDES Chemistry COHERENT SCATTERING CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Condensed matter: electronic structure, electrical, magnetic, and optical properties COPPER COMPOUNDS COPPER OXIDES CRITICAL CURRENT Cross-disciplinary physics: materials science rheology CRYSTAL DEFECTS CRYSTAL LATTICES CRYSTAL STRUCTURE CURRENT DENSITY CURRENTS DEPOSITION DIFFRACTION Diffraction patterns ELECTRIC CONDUCTIVITY ELECTRIC CURRENTS ELECTRICAL PROPERTIES ELECTRON MICROSCOPY ENERGY BEAM DEPOSITION Exact sciences and technology FABRICATION Geometric planes GRAIN BOUNDARIES HEAT TREATMENTS INTERFACES LATTICE PARAMETERS Material films Materials MATERIALS SCIENCE Metals, semimetals and alloys Microscopes MICROSCOPY MICROSTRUCTURE Microstructures ORTHORHOMBIC LATTICES OXIDES OXYGEN COMPOUNDS PHYSICAL PROPERTIES Physics SCATTERING Specific materials SUBSTRATES SUPERCONDUCTING FILMS Superconducting films and low-dimensional structures SUPERCONDUCTIVITY Superconductors SURFACE COATING TEXTURE THERMODYNAMIC PROPERTIES TRANSITION ELEMENT COMPOUNDS TRANSITION TEMPERATURE TRANSMISSION ELECTRON MICROSCOPY VOIDS X ray film X-RAY DIFFRACTION Yttrium YTTRIUM COMPOUNDS YTTRIUM OXIDES
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Beschreibung
Zusammenfassung:	The microstructure of superconducting films that have shown high-critical current densities has been studied. The films are shown to be epitaxial and contain twins and precipitates. The main difference between these films and low current carrying samples is the absence of grain boundaries. These boundaries are therefore identified as the cause of the lower critical current in ceramic samples.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.238.4825.342