Chemical solution derived YBa2Cu3.3O7-?/Y2O3(CuO) multilayers on oxide buffered metallic tapes

An approach based on the formation of insulating CuO /Y₂O₃ layer for YBa₂Cu₃O_7-δ (YBCO) coated conductor in a multilayer architecture structure is proposed with respect of high current-carrying ability. Double YBCO layers or oxide buffered metal substrate separated by CuO/Y₂O₃ insulating layer were deposited by so called Super-Low-Fluorine Metal organic Solution Deposition (SLF-MOD). X-ray diffraction measurement (XRD) revealed that both in-plane and out-of-plane textures of YBCO in the present quasi multilayers are as good as in pure YBCO films. Nanoscale Y₂O₃ precipitates grow epitaxially inside YBCO, and CuO disperse in YBCO layers. Magnetization data showed that Ic of the insulating multilayered films was enhanced in comparison with the pure YBCO films. More interestingly, the Ic value enhancement was obtained in the case of thin inserted layer of Y(Cu), otherwise, that layer of between first YBCO layer and metal substrate almost 50% improved. The microstructure optimization(texture, uniformity and porosity) in the inserted multilayered films was probably the reason for the enhancement of superconducting performance, which was confirmed by using the scanning electron microscopy (SEM) images.