Oxide buffer layer with perovskite structure for YBa/sub 2/Cu/sub 3/O/sub 7-x/ coated conductors prepared by metal-organic deposition method

For fabricating YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) coated conductors on metal substrates with high critical current density (J/sub c/), deposition of oxide buffer layers is very important. BaZrO/sub 3/ (BZO) and BaSnO/sub 3/ (BSO) with a perovskite structure have excellent chemical compatibility with YBCO and good lattice matching with oxide substrates, including NiO buffer by surface oxidation epitaxy process. We have fabricated BZO or BSO buffer layers on SrTiO/sub 3/ single-crystal substrates by metal-organic deposition (MOD) method, in order to investigate the effects of buffer layers on superconducting properties of YBCO films. J/sub c/ of YBCO films deposited by pulsed laser deposition on BZO reached 0.29 MA/cm/sup 2/ (77 K, 0 T).