Oxide buffer layer with perovskite structure for YBa2Cu3O7-x coated conductors prepared by metal-organic deposition method

For fabricating YBa₂Cu₃O_7-x (YBCO) coated conductors on metal substrates with high critical current density (J_c), deposition of oxide buffer layers is very important. BaZrO₃ (BZO) and BaSnO₃ (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 SrTiO₃ 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_c of YBCO films deposited by pulsed laser deposition on BZO reached 0.29 MA/cm² (77 K, 0 T).