Preparation of double-sided CeO/sub 2/ buffer layers on MgO substrates for YBa/sub 2/Cu/sub 3/O/sub 7-x/ films

Double-sided CeO/sub 2/ buffer layers were fabricated by pulsed-laser deposition on 20 mm * 20 mm MgO[100] substrates to apply YBCO films using the TFA-MOD (trifluoroacetate-metalorganic deposition) process for microwave devices. The double-sided CeO/sub 2/ films had the characteristics of a smooth surface (R/sub ms/ < 1 nm) and a highly [100] aligned orientation, which is almost independent of thickness. We successfully obtained a YBCO film deposited by the TFAMOD process on CeO/sub 2//MgO[100], which had a critical current density (J/sub c/) of 6 MA/cm/sup 2/ (77 K, 0 T) with good reproducibility.