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SOLID-STATE CATALYSIS OF SUPERCONDUCTING CUPRATES

United States Patent Application

20130324414
A1
View the Complete Application at the US Patent & Trademark Office
Brookhaven National Laboratory - Visit the Office of Technology Commercialization and Partnerships Website
Catalytically active (001) ceria substrates or buffers are used to modify the structure of the epitaxial high temperature superconductor YBa.sub.2Cu.sub.3O.sub.7. The catalytically active substrate has a small lateral grain size, typically less than 50 nm, to provide a high density of nucleation sites, at some of which nucleate a previously unknown metastable phase. The modification is achieved by catalytically assisted synthesis of the metastable phase. The new phase, a long-period (3.5-nm) perovskite, intercalates into the YBa.sub.2Cu.sub.3O.sub.7 matrix without negatively affecting the critical temperature of the film. Analysis of electron microscopy and synchrotron X-ray diffraction data allow identification of the phase as a long-period YBa.sub.2Cu.sub.3O.sub.7 derivative formed through short-range cation displacement. The films, from about 100-nm to about 1000-nm thick, exhibit strong enhancement of the critical current density, reaching a maximum of approximately 4.2 MA/cm.sup.2 at 77 K.
Solovyov, Vyacheslav F. (Rocky Point, NY), Li, Qiang (Setauket, NY)
BROOKHAVEN SCIENCE ASSOCIATES, LLC (Upton NY)
13/ 814,284
August 4, 2011
[0001] This invention was made with Government support under contract number DE-AC02-98CH10886, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.