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Effect of swift heavy ions irradiation on the microstructure and current-carrying capability in YBa2Cu3O7-delta high temperature superconductor films

文献类型：期刊论文

作者Liu Li1,2; Liu Jie1,2; Zeng Jian1,2; Zhai Peng-Fei1,2; Zhang Sheng-Xia1; Xu Li-Jun1,2; Hu Pei-Pei1; Li Zong-Zhen1,2; Ai Wen-Si1,2
刊名ACTA PHYSICA SINICA
出版日期2020-04-05
卷号69期号:7页码:8
关键词YBCO high temperature superconducting films swift heavy ions irradiation pinning
ISSN号1000-3290
DOI10.7498/aps.69.20191914
通讯作者Liu Jie(j.liu@impeas.ac.cn)
英文摘要YBa2Cu3O7-delta (YBCO) high temperature superconductor materials have many promising applications in energy, transportation and so on. Nonetheless, the application of YBCO in high magnetic field was limited because of low critical current. One-dimensional latent tracks produced by swift heavy ions irradiation can be effective pinning centers, thus enhancing superconductivity in external field. YBCO high temperature superconducting films were irradiated with 1.9 GeV Ta ions at room temperature and vacuum condition. Structure damages in irradiated samples were characterized by transmission electron microscopy (TEM). Continuous amorphous latent tracks, with diameter from 5 nm to 15 nm, throughout the whole superconducting layer can be observed from TEM images. Physical property measurement system (PPMS) was used to measure superconducting properties of samples before and after irradiation. When irradiated at optimal fluence of 8 x 1010 ions/cm(2), critical current reaches its maximum value and pinning force was twice of unirradiated sample, while critical temperature almost unchanged. The analysis of experimental results shows that latent tracks produced by swift heavy ions irradiation can enhance in-field current-carrying capability, without decreasing critical temperature. In the power-law regime proportional to B-alpha values of a decreased with the increasing of fluence, indicating a weaker magnetic field dependence of critical current. a reaches its lowest value 0.375 when irradiated at a fluence of 5.0 x 10(11) ions/cm(2), corresponding to a lowest in-field J(c). This result may be a combination of increasing pinning centers and decreasing superconductor volumes that work together. Normalized pinning force f(p) = F-p/F-p,F-max. of sample irradiated with different fluence as a function of magnetic field h = H/H-max 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.
WOS关键词BA-CU-O ; COLUMNAR DEFECTS ; CURRENT DENSITIES ; YBCO FILMS ; THIN-FILMS ; PROPERTY ; CRYSTALS ; FIELDS ; DAMAGE ; HTS
资助项目National Natural Science Foundation of China[11675233] ; National Natural Science Foundation of China[11690041] ; National Natural Science Foundation of China[11705246] ; CAS Light of West China Program ; Natural Science Foundation of Gansu Province, China[18JR3RA392]
WOS研究方向Physics
语种英语
WOS记录号WOS:000527806200029
出版者CHINESE PHYSICAL SOC
资助机构National Natural Science Foundation of China ; CAS Light of West China Program ; Natural Science Foundation of Gansu Province, China
源URL[http://119.78.100.186/handle/113462/140501]  
专题中国科学院近代物理研究所
通讯作者Liu Jie
作者单位1.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
2.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu Li,Liu Jie,Zeng Jian,et al. Effect of swift heavy ions irradiation on the microstructure and current-carrying capability in YBa2Cu3O7-delta high temperature superconductor films[J]. ACTA PHYSICA SINICA,2020,69(7):8.
APA Liu Li.,Liu Jie.,Zeng Jian.,Zhai Peng-Fei.,Zhang Sheng-Xia.,...&Ai Wen-Si.(2020).Effect of swift heavy ions irradiation on the microstructure and current-carrying capability in YBa2Cu3O7-delta high temperature superconductor films.ACTA PHYSICA SINICA,69(7),8.
MLA Liu Li,et al."Effect of swift heavy ions irradiation on the microstructure and current-carrying capability in YBa2Cu3O7-delta high temperature superconductor films".ACTA PHYSICA SINICA 69.7(2020):8.

入库方式： OAI收割

来源：近代物理研究所

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