SUPERCONDUCTING ARTICLE HAVING LOW AC LOSS

摘要

A multifilamentary superconducting composite article includes a plurality of oxide superconducting filaments in a ductile metal matrix arranged about a central core, and a region of high resistivity embedded within and adherent to the metal matrix and substantially surrounding each oxide superconducting filament. The high resistivity region is perforated and the perforation is occupied by a material having a bulk material resistivity greater than 0,4 mu -cm. The article demonstrates a filament to filament resistance greater than 1 x 10<-6> ohm-cm at T > Tc where resistance is the four-point transport resistance between filaments multiplied by the measured sample length The ac power loss in a field perpendicular to the strand surface or in any other orientation is less than 2.5 mW/A at greater than 10 mT (RMS ac field, 30-300 Hz), as measured by magnetic methods without transport current. Methods of manufacture are provided.