\begin{document}${J_c} \propto {B^{ - \alpha }}$\end{document} values of ɑ decreased with the increasing of fluence, indicating a weaker magnetic field dependence of critical current. ɑ reaches its lowest value 0.375 when irradiated at a fluence of 5.0 × 1011 ions/cm2, corresponding to a lowest in-field Jc. This result may be a combination of increasing pinning centers and decreasing superconductor volumes that work together. Normalized pinning force fp = Fp/Fp,max of sample irradiated with different fluence as a function of magnetic field h = H/Hmax was analyzed using Higuchi model. Fitting results show that planar defects are main source of pinning when h > 1, independent of irradiation. Whereas, dominate pinning centers shifting from surface pinning to isotropic normal point pinning with increasing fluence when h < 1. Given that latent tracks produced by Ta ions irradiation act as strong anisotropic pinning centers, the reason of the dominate pinning centers change with increasing fluence remains to be further studied."> Effect of swift heavy ions irradiation on the microstructure and current-carrying capability in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-<i>δ</i></sub> high temperature superconductor films - 必威体育下载

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    Liu Li, Liu Jie, Zeng Jian, Zhai Peng-Fei, Zhang Sheng-Xia, Xu Li-Jun, Hu Pei-Pei, Li Zong-Zhen, Ai Wen-Si
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    • Abstract views:7121
    • PDF Downloads:100
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    • Received Date:17 December 2019
    • Accepted Date:17 January 2020
    • Published Online:05 April 2020

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