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Tuning the microstructure and vortex pinning properties of YBCO-based superconducting nanocomposite films by controlling the target rotation speed
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Department of Materials Science and Engineering, Kyushu Institute of Technology
Department of Materials Science and Engineering, Kyushu Institute of Technology
Department of Materials Science and Engineering, Kyushu Institute of Technology
Institute for Sustainable Sciences and Development, Hiroshima University
Institute for Sustainable Sciences and Development, Hiroshima University
Department of Energy Engineering and Science, Nagoya University
Institute for Materials Research, Tohoku University
抄録
We report the controlled incorporation of perovskite, BaSnO3 (BSO), and double-perovskite, YBa2NbO6 (YBNO), nanocolumnar structures into a YBa2Cu3O7−δ (YBCO) film matrix by controlling the target rotation speed. A surface modified target approach has been employed to deposit YBCO+BSO and YBCO+YBNO nanocomposite films using a laser ablation technique. The effect of target rotation speed on the microstructure and subsequently on the superconducting properties has been studied in detail. The density of BSO and YBNO nanocolumnar structures is found to depend on the target rotation speed, which subsequently affects the vortex pinning properties of the superconducting films in the absence and presence of applied magnetic fields. Three rotation speeds, 3, 2 and 1 s/rot., have been attempted in this study. Compared to pure YBCO, the YBCO+BSO and YBCO+YBNO nanocomposite films exhibit superior in-field critical current density (JC) and also exhibit a strong JC peak for H ∥ c-axis, indicating strong c-axis pinning. The irreversibility line has also been found to improve significantly in the nanocomposite films. For both the target combinations (YBCO+BSO and YBCO+YBNO), the target rotation speed of 2 s/rot. has been found to give the optimum superconducting properties.
雑誌名
Superconductor Science & Technology
巻
27
号
2
ページ
025009
発行年
2013-12-19
出版者
IOP Publishing
ISSN
0953-2048
DOI
https://doi.org/10.1088/0953-2048/27/2/025009
権利
Copyright (c) 2014 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Superconductor Science and Technology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/0953-2048/27/2/025009.
Tuning the microstructure and vortex pinning properties of YBCO-based superconducting nanocomposite films by controlling the target rotation speed
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