掺杂Y_2O_3和BaCeO_3提高MOD-YBCO超导性能的研究

Enhanced flux pinning in MOD-YBCO films with co-doping of BaCeO_3 and Y_2O_3 nanoparitcles

本文通过在前驱液中添加过量钇盐和铈的有机盐,采用三氟乙酸盐-金属有机沉积法(TFA-MOD)在铝酸镧单晶基体上制备了含有纳米氧化钇和纳米铈酸钡的YBCO薄膜.与纯YBCO薄膜相比,掺杂Y2O3/BaCeO3的YBCO膜的临界转变温度几乎保持不变,为91K左右.而掺杂Y2O3/BaCeO3的YBCO膜的临界电流密度达到5.0MA/cm2(77K,0T),是纯YBCO膜临界电流密度的1.5倍.薄膜中的Y2O3和BaCeO3可能在YBCO内部起到了有效的钉扎磁通作用.

Enhancing the critical-current density of YBCO films is essential to gain a deeper understanding of the vortex pinning mecha- nisms and enable commercial applications of high-temperature superconductivity. Combined BaCeO3 and Y2O3 nanoparticles have been achieved to be co-doped in YBa2Cu3O7-x （YBCO） films by metalorganic deposition using trifluoroacetates （TFA-MOD）. The formation of integrated nanoparticles increases the critical current density （Jc） of Y2O3/BaCeO3 doped-YBCO films while keeping the critical transition temperature （Tc） close to that in the pure YBCO films. YBCO film containing BaCeO3 and Y2O3 showed Tc value of 91 K and Jc value of 5 MA/cm2 at self-field （0 T, 77 K）. The strongly enhanced flux pinning over a wide range of magnetic field may be attributed to the combined BaCeO3 and Y2O3 created by optimized TFA-MOD conditions.