Abstract
An ac electrodeposition (ED) process to obtain good quality YBa 2Cu 3O 7−δ (YBCO) high-temperature superconductor (HTS) films was developed. These films were deposited on SrTiO 3 (100) single crystal substrates previously coated with a thin silver layer (800 Å) that was deposited by chemical reduction. A small amount of Ag (0.7% in weight) added to the electrolyte bath was shown to improve the quality of the deposited films. YBCO films after an appropriate heat treatment present single phase material with an onset T c ∼ 90 K, ΔT c ∼ 2 K, homogeneous grain morphology and strong biaxial texture. Transport measurements show a metallic behavior in the normal state and a self-field critical current densities ∼ 10 5 A/cm 2 at 4.2 K and ∼ 10 4 A/cm 2 at 77K.
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