Film growth of BaZrO₃-doped YBa₂Cu₃O_7−δ by using fluorine-free metal–organic deposition

ISSN： 0953-2048

Source： Superconductor Science and Technology, Vol.25, Iss.1, 2012-01, pp. : 15011-15016

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Abstract

In this study, BaZrO₃ (BZO)-doped YBCO films were fabricated on SrTiO₃(100) single-crystal substrates by a fluorine-free metal–organic deposition (MOD) process. We added extra Ba and Zr organic salts, which formed well-dispersed ∼10–25 nm sized BaZrO₃ nanoparticles in the YBCO films. The in-field critical current density (J_c) and the peak pinning force (F_p) were greatly enhanced in the BZO-doped sample at 77 K relative to pure YBCO films. The optimal BZO content that gave the highest peak pinning force of ∼10 GN m⁻³ in a ∼180 nm thick film was found to be x = 0.10 for YBCO + xBZO films, where x is moles of BZO per 1 mol of YBCO. The angular dependence of in-field J_c measurements shows the BZO nanoparticles increased J_c over the entire angular range and also reduced the angular anisotropy measured at 4 T at 77 K.

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