Abstract
The Sm-doping YBCO films, Y1−xSmxBa2Cu3Oy and Y1SmxBa2−xCu3Oy (x=0.1, 0.3), were fabricated on LAO (00l) single-crystal substrates by TFA-MOD process in order to improve the superconducting properties of YBCO films. The XRD analyses indicated that these samples have a strong c-axis texture, but the secondary phase of BaCuO2 are found from Y1SmxBa2−xCu3Oy films with Sm3+ substitution on Ba2+ sites. High quality surface, better in-plane and out-of-plane texture of the Sm-doping films have been obtained compared with that of the undoped YBCO film. The Y0.9Sm0.1Ba2Cu3Oy films showed the highest value of Tc and Jc in self-field. Superconducting properties of all Sm-doping films are better than those of the pure film. These results strongly suggest that Sm-substitution on Y or Ba sites of YBCO phase is a powerful method to efficiently improve Jc and introduce artificial pinning centers in YBCO films.
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