中文摘要：

采用无氟高分子辅助金属有机物沉积法（PA-MOD）在LaAIO3（LAO）单晶衬底上制备了一系列YBa2Cu3-xNixO7-z（x=0、0．0005、0．001、0．0015、0．002）超导薄膜。利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）及综合物性测量系统（PPMS）分别研究了微量Ni2＋掺杂YBCO薄膜的晶体结构、表面形貌及超导性能。结果表明，微量Ni2＋掺杂明显提高YBCO薄膜在外加磁场下的临界电流密度，说明微量Ni2＋掺杂增强了YBCO薄膜的磁通钉扎性能。

英文摘要：

YBa2Cu3-xNixO7-z films with x =0, 0. 0005,0. 001,0. 0015 and 0. 002 were prepared on LaAIO3 substrate by a fluorine - free polymer - assisted metal organic deposition method. Their microstructure, surface morphology and superconductivity were investigated by X - ray Diffraction, Scanning Electron Microscope and Physical Property Measurement System. The results show that the critical current density of YBCO thin films could be improved by dilute Ni2 ＋ doping markedly, especially in higher applied magnetic field. The rather for that could be due to the enhanced flux pinning in these YBCO thin films by Ni2＋ doping.