Highly textured CeO2 buffer layers on metallicsubstrates for YBCO coated conductors

摘要

We developed a simple route for the e-beam deposition of CeO2buffer layers on biaxially textured Ni-5W substrates. Our analysis of themicrostructure of films grown under various deposition conditions showsthat the highest degree of in-plane texture is obtained by growing the filmin a reducing atmosphere at 690°C with a rate of 2.4 ?/s. We found thatthese conditions prevent substrate oxidation. YBCO films deposited on100 nm CeO2 buffered Ni-5W tapes exhibit excellent superconductingproperties with critical temperatures Tc≈88 K (midpoint) and transportcritical current densities Jc's up to 2 MA/cm2 at 77 K, self field.