Radiation effect of swift heavy ions on current-carrying capability of commercial YBCO coated conductors
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Radiation effect of swift heavy ions on current‑carrying capability of commercial YBCO coated conductors Li Liu1,2 · Jie Liu1,2 · ShengXia Zhang1 · Jian Zeng1,2 · PengFei Zhai1,2 · PeiPei Hu1 · LiJun Xu1,2 · ZongZhen Li1,2 · WenSi Ai1,2 · ChuanBing Cai3,4 · MinJuan Li3 Received: 24 March 2020 / Accepted: 30 April 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This paper presents the swift heavy ions irradiation effects in commercial Gd-doped YBCO ( YGd0.2Ba2Cu3O7−x) coated conductors irradiated by 1.9 GeV 181Ta ions with a wide range of ion fluences. Both continuous latent tracks produced by incident ions and nonuniform inclusions induced during film manufacture can be observed from TEM images, proving the existence of mixed-pinning landscapes. Onset critical temperature Tc,on is almost unchanged (△Tc,on ≈ 0.5 K) when irradiated at optimal fluence of 5.0 × 1010 ions/cm2, whereas in-field critical current Jc increased to a factor of more than 2 over a wide range of magnetic field at 77 K. Moreover, the value of α in power-law regime has been reduced to 0.31, compared to 0.72 for pristine sample, indicating slower Jc decay with magnetic field after Ta ions irradiation. Peak value of Jc, irradiated/ Jc, pristine curve appears when external magnetic field is near matching field at which the density of vortice equal to ion fluence. Experimental results proving that latent tracks can further enhance in-field current-carrying capability of commercial YBCO coated conductors. Keywords Swift heavy ions irradiation · Commercial Gd-doped YBCO coated conductors · Latent tracks · Critical current density
1 Introduction The rare earth based coated conductors have many promising applications in special environments due to its unique characteristics such as high-current-carrying capacity and mechanical strength. Nowadays, long YBCO coated conductors deposited on grain-oriented metallic tapes have already * Jie Liu [email protected] Li Liu [email protected] 1
Institute of Modern Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, People’s Republic of China
2
School of Nuclear Science and Technology, University of Chinese Academy of Sciences (UCAS), Beijing 100049, People’s Republic of China
3
Shanghai Key Laboratory of High Temperature Superconductors, Physics Department, Shanghai University, Shanghai 200444, People’s Republic of China
4
Shanghai Creative Superconductor Technologies Co., Ltd, Shanghai 201401, People’s Republic of China
become commercial products [1, 2]. To achieve higher critical current is the goal of fundamental research. Artificial defects which can be introduced with various methods can act as effective pinning centers in high temperature superconductors (HTS), thus improving superconductivity [3–6]. Compared with other defects, one-dimensional defects are thought to be excellent pinning centers since it can pin vortices along its entire length when its direction parallel to external magnetic field, thus producing maximal pinning potential [7]. One-di
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