Development of long Y-123 coated conductors by ion-beam-assisted-deposition and the pulsed-laser-deposition method

Abstract

100 m class Y-123 coated conductors were produced by using reel-to-reel vacuum ion-beam-assisted-deposition (IBAD) and pulsed-laser-deposition (PLD) apparatuses. 100 m long IBAD-Gd2Zr2O7 template films were uniformly and routinely obtained on non-textured Ni-alloy tapes, with FWHM of Δϕ below 10°. Y-123 films with FWHM of Δϕ below 7° were formed on them by PLD. End-to-end Ic of 38 A and Jc of 0.76 MA cm−2 (77 K, self-field) were obtained in a 100 m long sample. For further texture improvement, secondary buffer layers of CeO2 and Gd2Zr2O7 grown by PLD on IBAD-Gd2Zr2O7 template films were studied. Δϕ of 3° and Jc of 2.9 MA cm−2 were obtained in a 0.1 m long Y-123 film and Jc improved to 1.6 MA cm−2 for an 80 m long Y-123 tape by using the CeO2 buffer layers.