The YBCO films with Zr⁴⁺ doping grown by MOD method

M. Liu, H. L. Suo, S. Ye,
D. Q. Shi, Y. Zhao, L. Ma and M. L. Zhou

Abstract—YBa₂Cu₃O_7−δ (YBCO) films with Zr doping have been prepared successfully by the trifluoroacetate metal-organic deposition (TFA-MOD) method through dissolving Zr acetylacetonate into the precursor solution. Yttria-stabilized zirconia YSZ）nanoparticles were detected in the doped YBCO films by XRD and SEM. From the analysis of XRD ω and φ scans, the doped films have better out-of-plane and in-plane textures than those of the un-doped YBCO film. Although the doped YBCO films have lower T_c than that of the un-doped YBCO film, a very significant enhancement of J_c is displayed as compared to the undoped film at applied fields. A high J_c near 105 A cm^-2 at 2 T, 77K was observed in the Zr doped film, which is 30 times of theJ_c values for the un-doped film in the same applied fields, indicating that an effective pinning force was created by Zr doping.

Index Terms—Nanoparticle doping, TFA-MOD, YBCO film

Manuscript received August 20, 2008. This work was supported by the National Basic Research Program 973 of China (2006CB601005), National Natural Science Foundation of China (50771003), National High Technology Research and Development Program of 863 (2007AA03Z242)and the program of a Foundation for the Author of National Excellent Doctoral Dissertation of China (200331).
M. Liu, H. L. Suo, S. Ye, Y. Zhao, L. Ma and M. L. Zhou are now with College of Materials Science and Engineering, Beijing University of  Technology,  Beijing, 100022 China. (corresponding author: M. Liu; phone: +86-010-673-929-47; fax: +86-010-673-929-47; e-mail:Lm@bjut.edu.cn)
D.Q. Shi is now with the Institute for Superconducting and Electronic Materials, the University of Wollongong, NSW 2522，Australia (e-mail: dongqi@uow.edu.au).

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