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Effects of Neutron Irradiation on Superconducting Properties of GdBa2Cu3O7-δ Single Domain Superconductor
Hong Zhang1, Guang Li1, Tao-fei Zhou1, Yong Liu1, Xiao-guang Li*1, Yu Chen2
1.Hefei National Laboratory for Physical Sciences at Microscale, and Department of Physics, University of Science and Technology of China, Hefei 230026, China;2.Joint Institute of Applied Nuclear Technology, Shenzhen University, Shenzhen 518060, China
Abstract:
The effects of neutron irradiation with a fluence of 1015 n/cm2 on the superconducting properties of GdBa2Cu3O7-δsingle domain sample were studied. The point and cascade defects produced by the neutron irradiation were observed by high-resolution transmission electron microscopy. The cascade defects were found to have the sizes of about 4-7 nm which is comparable to the coherence lengths of high temperature superconductors. The point defects disappear while the cascades still exist through thermal annealing. The temperature dependence of magnetization for the magnetic field parallel to the crystallographic c axis shows that the neutron irradiation leads to a dramatic degradation of uperconductivity for the as-irradiated sample, a decrease of critical current density (Jc), and the weakening of the fishtail effect in the Jc versus magnetic induction B curve. However, for the as-irradiated sample annealed in the flowing oxygen atmosphere, it shows that Jc under high magnetic fields is greatly enhanced, the fishtail shifts towards higher magnetic fields, and its superconductivity is partially recovered as well due to the remaining effecive pinning centers of the cascades. These results suggest a prospective application for such a treated GdBa2Cu3O7-δsuperconductor.
Key words:  Neutron irradiation, Superconductivity, Critical current density
FundProject:
中子辐照对GdBa2Cu3O7-单畴超导性能的影响
张红1, 李广1, 周桃飞1, 刘勇1, 李晓光*1, 陈羽2
1.合肥微尺度物质科学国家实验室,中国科学技术大学物理系,合肥 230026;2.深圳大学核技术研究所,深圳 518060
摘要:
研究了中子辐照对GdBa2Cu3O7-±单畴超导性能的影响,使用的辐照剂量为1015 n/cm2.通过高分辨电镜观察发现中子辐照产生球形的缺陷和小的点缺陷,这些球形缺陷的尺寸在4?7 nm,与高温超导相干长度相当,并且在退火过程中稳定存在,而小的点缺陷在退火过程中消失.磁测量结果显示中子辐照使样品的超导电性严重退化,临界电流密度下降并且鱼尾峰效应几乎消失.然而对辐照的样品退火处理后,其超导电性明显改善,临界电流密度显著提高并超过了未经辐照的样品,鱼尾峰也向高场移动.这些结果表明中子辐照和退火处理使GdBa2Cu3O7-±单畴样品中引入了有效的磁通钉扎中心(即球型的缺陷)从而导致其临界电流密度大幅提高.
关键词:  中子辐照,超导,临界电流密度
DOI:10.1088/1674-0068/20/03/324-328
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