La2Zr2O7single buffer layer for YBCO RABiTS coated conductors

Chemical deposition methods like MOD and MOCVD are promising approaches for coated conductors (CCs) due to their reduced cost and easy scaling. High quality La 2 Zr 2 O 7 (LZO) buffer layers were prepared by MOD on Ni–5 at.% W (NiW) RABiTS and subsequent YBCO layers (450–800 nm thick) were deposited by pulsed injection MOCVD, leading to a simple low cost architecture NiW RABiTS /LZO MOD /YBCO MOCVD . In this novel combination of MOD and MOCVD approaches, a single LZO MOD buffer layer is sufficient to ensure structural compatibility between YBCO and NiW, and protect the substrate from oxidation during YBCO MOCVD. YBCO films were epitaxially grown on LZO and exhibited critical current densities J c close to 1 MA cm −2 at 77 K with a critical temperature T c = 91 K and Δ T c <1 K.