微量Ni^2＋掺杂MOD-YBCO薄膜性能的研究

Study on property of MOD-YBCO films doping with dilute Ni^(2+)

采用无氟高分子辅助金属有机物沉积法(PA-MOD)在La Al O3(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。

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.