Superconductivity in YBa2Cu3-yNiyO7-δ

Abstract

Superconductivity in alloyed compounds YBa₂Cu_3-y Ni _y O_7-δ has been studied in order to gain direct insights on the roles different Cu sites play in electrical conduction. Electron probe microanalysis as well as X-ray powder diffraction analysis shows that Ni is actually substituted for Cu in the oxygen-deficient perovskite compound for y at least as much as 0.27. Electrical resistivity measurements revealed that the substituted Ni does not substantially destroy the superconductivity.