Surface-oxidation epitaxy of Ni-clad Ni-20wt%Cr and Ni-clad austenitic stainless steel tapes for Y-Ba-Cu-O coated conductors

We have prepared Ni-clad Ni-20wt % Cr (Ni/NiCr) and Ni-clad austenitic stai nless steel (NI/SS) tapes for YBa2Cu3Ox (YBCO) coated conductors with highe r strength and lower magnetism than those of pure nickel tape. Highly {100} < 001 > textured nickel outermost layers on those composite tapes were obta ined by cold-rolling and subsequent heat treatment, The surfaces of Ni/NiCr composite tape and Ni/ SS composite tape are favorable for epitaxial NiO g rowth by surface-oxidation epitaxy (SOE) method, Highly {100}< 001 > textur ed NiO layers were formed on those textured composite tapes as same as on c ube-textured pure nickel tapes. Biaxially textured YBCO films were grown on SOE-NiO layers by pulsed laser deposition (PLD) method. A thin MgO cap lay er deposited on NiO layer improved surface qualities of NiO, so that the YB CO films with high critical current density (Jc) of 1.0 x 10(5) A/cm(2) (77 K, 0T) have been obtained on SOE-NIO with MgO cap layer of Ni/NiCr composit e tape.