Superconducting thin film and wire on a smooth substrate

摘要

Improvement in a superconducting thin film of compound oxide represented by the formula: LnBa2Cu3O7- delta (Ln is lanthanide) or (La1-x alpha x)2CuO4 ( alpha is Ba or Sr) deposited on a substrate or core made of MgO, SrTiO3 or ZrO2 by physical vapor deposition technique, the surface roughness Rmax (datum length=1,000 mu m) of the superconducting thin film being less than 0.2 mu m.