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In order to further improve the superconducting current carrying capacity of RE-Ba-Cu-O coated conductor under the action of strong magnetic field, ion irradiation is used to generate the pinning centers of introduced magnetic flux in the RE-Ba-Cu-O coated conductor. In this work, the H+-ion irradiation of second-generation high-temperature superconductor RE-Ba-Cu-O strip is carried out by using the 320 kV high charge state ion synthesis research platform. Doppler broadened slow positron beam analysis combined with Raman spectroscopy is used to measure the change of microstructure in Y0.5Gd0.5Ba2Cu3O7–δ (YBCO) sample irradiated by H+ ions in a range of 5.0 × 1014–1.0 × 1016 ions/cm2. The positron annihilation parameters in YBCO before and after irradiation are analyzed. It is found that after 100 keV H+ ion irradiation, a large number of defects including vacancies, vacancy groups or dislocation groups are produced in the superconducting layer. The larger the irradiation dose, the more the produced vacancy type defects are and the more complex the defect types, and the annihilation mechanism of positrons in the defects changes. Raman spectroscopy results show that with the increase of H+ ion irradiation dose, the oxygen atoms in the coating rearrange, the plane spacing increases, the orthogonal phase structure of the coating is destroyed, and the degree of order decreases. The defects produced by such an ion irradiation lay a foundation for the introduction of flux pinning centers. Further research can be carried out in combination with X-ray diffractometer, transmission electron microscope, superconductivity and other testing methods to provide theoretical and practical reference for the optimization of material properties. -
Keywords:
- second-generation high temperature superconductivity /
- ion irradiation /
- positron annihilation /
- holes
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图 1 超导带材结构
Figure 1. Structure of superconducting tape.
图 2 H+离子辐照深度
Figure 2. Simulated penetration depth by H+ ion irradiation.
图 3 不同剂量H+离子辐照离位损伤
Figure 3. Simulated displacement damage by H+ ion irradiation at different doses.
图 4 不同剂量H+离子辐照前后, 样品S参数及W参数随正电子入射能量的变化关系
Figure 4. Variation of S and W parameters of samples with positron incident energy before and after H+ ion irradiation with different doses.
图 5 不同剂量H+离子辐照前后样品的S参数随W参数的变化关系
Figure 5. Variation of S parameters with W parameters of samples before and after H+ ion irradiation with different doses.
图 6 不同剂量H+离子辐照前后样品的拉曼光谱
Figure 6. Raman spectra of samples before and after H+ ionirradiation with different doses.
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[1] Bremmer H, De Haas W J 1936 Physica 3 687
Google Scholar
[2] Boorse H A 1935 Nature 135 827
Google Scholar
[3] 屈翠芬 1982 稀有金属材料与工程 02 104
Qu C F 1982 Rare Met. Mater. Eng. 02 104
[4] Bondarenko S I, Koverya V P, Krevsun A V, Link S I 2017 Low Temp. Phys. 43 1125
Google Scholar
[5] 蔡传兵, 池长鑫, 李敏娟, 刘志勇, 鲁玉明, 郭艳群, 白传易, 陆齐, 豆文芝 2019 科学通报 64 827
Cai C B, Chi C X, Li M J, Liu Z Y, Lu Y M, Guo Y Q, Bai C Y, Lu Q, Dou W Z 2019 Sci. Bull. 64 827
[6] Wang K, Hou Q, Arnab Pal 2021 J. Super. Novel Magn. 34 1379
Google Scholar
[7] 蔡传兵, 刘志勇, 鲁玉明 2011 中国材料进展 30 1
Cai C B, Liu Z Y, Lu Y M 2011 Mater. China. 30 1
[8] 刘建华, 程军胜, 王秋良 2017 电工电能新技术 36 1
Google Scholar
Liu J H, Cheng J S, Wang Q L 2017 Adv. Technol. Electral. Eng. Energ. 36 1
Google Scholar
[9] Dadras S, Falahati S, Dehghani 2018 Physica C 548 65
Google Scholar
[10] Palau A, Valles F, Rouco V 2018 Supercond. Sci. Technol. 31 034004
Google Scholar
[11] Johnson C L, Bording J K, Zhu Y 2008 Phys. Rev. B 1 775
[12] Foltyn S R, Civale L, Macmanusdriscoll J L 2007 Nat. Mater. 6 631
Google Scholar
[13] 王雅, 索红莉, 毛磊 2019 无机材料学报 10 1055
Wang Y, Suo H L, Mao L 2019 J. Inorg. Mater. 10 1055
[14] Senatore C, Alessandrini M, Lucarelli A 2014 Supercond. Sci. Technol. 27 103001
Google Scholar
[15] 李太广 2021 硕士学位论文 (北京: 中国科学院大学)
Li T G 2021 M. S. Thesis (Beijing: Chinese Academy of Science University) (in Chinese)
[16] Sueyoshi T, Sogo T, Nishimura T, et al. 2016 Supercond. Sci. Technol. 29 065023
Google Scholar
[17] 贺玮迪, 张培源, 刘翔 2021 物理学报 70 167803
Google Scholar
He W D, Zhang P Y, Liu X 2021 Acta Phys. Sin. 70 167803
Google Scholar
[18] Ramachandran R, David C, Magudapathy P, Rajaraman R, Govindaraj R, Amarendra G 2019 Fusion Eng. Des. 142 55
Google Scholar
[19] Zibrov M, Egger W, Heikinheimo J 2020 J. Nucl. Mater. 531 152017
Google Scholar
[20] 王少阶, 陈志权, 王波, 吴奕初, 方鹏飞, 张永学 2008 应用正电子谱学 (武汉: 湖北科学技术出版社) 第57页
Wang S J, Chen Z Q, Wang B, Wu Y C, Fang P F, Zhang Y X 2008 Apply of Positron Spectroscopy (Wuhan: Hubei Science and Technology Press) p57 (in Chinese)
[21] Thomas J, Bastasz R 1981 J. Appl. Phys. 52 6426
Google Scholar
[22] Wilson W D, Bisson C L, Baskes M I 1981 Phys. Rev. B 24 5616
Google Scholar
[23] Staikov P, Djourelov N 2013 Physica B 413 59
Google Scholar
[24] Puska M J, Lanki P, Nieminen R M 1989 J. Phys. Condens. Matter. 1 6081
Google Scholar
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