Abstract: Y_0.5Yb_0.5BCO film was successfully fabricated by fluorine-reduced metalorganic deposition (MOD) method through mixing the same concentrated YBCO and YbBCO precursor solution with 1:1 volume ratio. The film has strong (00l) peaks and well biaxial texture. The surface of the film is dense without any cracks and pores. Besides, the elemental distribution is well-proportioned. It is found that the Yb elemental substitution improves the in-field properties effectively, especially at high fields, although it decreases the critical transition temperature (T_c) of the Y_0.5Yb_0.5BCO film. For example, the Jc value of Y_0.5Yb_0.5BCO film is as higher as 1.26 times than that of the pure YBCO film at 77K and 3T applied field. In order to further improve the property at lower field, 6mol% TaCl₅ is added to Y_0.5Yb_0.5BCO precursor solution to obtain the Ta⁵⁺-doped Y_0.5Yb_0.5BCO film. The current carrying ability of the Ta⁵⁺-doped Y_0.5Yb_0.5BCO film is enhanced within the measured fields.

Key words: Y_0.5Yb_0.5BCO film, elemental substitution, nanoparticle doping, fluorine-reduced MOD, Field-property