中文摘要：

本研究通过低氟 MOD 法成功地制备了 Nb5＋掺杂的 YBa2Cu3O7-x（YBCO）薄膜, Nb5＋在薄膜中生成了大小在20~30 nm 之间的纳米颗粒; 纳米颗粒的生成不会对 YBCO 薄膜的织构和临界温度（Tc）构成明显的影响。由于纳米颗粒的引入, 掺杂后薄膜的临界电流密度（Jc）在整个磁场范围内都要高于纯的 YBCO, 自场下的 Jc更是达到了 3.4 MA/cm2。掺杂薄膜的钉扎力（Fp）也远远大于纯 YBCO, 最大钉扎力达到了 3.25 GN/m3, 有效地提高了 YBCO 在外加磁下的超导性能。

英文摘要：

Nb5＋-doped YBCO film was fabricated successfully by low-fluorine metal organic deposition （MOD） method. The effective pinning centers in doped film are attributed to Nb-containing nanoparticles with the size of 20-30 nm. Meas- urement results show that the texture and critical temperature of the doped film are not influenced obviously by the nanopar- titles. In addition, a significant enhancement of J~ is observed for YBCO films with nanoparticles compared to that of pure YBCO film by the field dependence of Jc values. The self-field critical current density reaches as high as 3.4 MA/cm2, and the peak pinning force （Fp） of the doped film is greatly increased than the pure one, which reaches at 3.25 GN/m3.