报道了用脉冲激光沉积技术(PLD)在CeO_2/YSZ/Y_2O_3/NiW衬底上连续制备YBCO超导层的研究结果.分析了衬底温度、薄膜厚度和退火时间分别对YBCO的织构、表面形貌及c轴晶格常数的影响.实验发现温度较低将导致a轴晶粒的生长,薄膜太厚将引起表面形貌变差,而YBCO薄膜c轴晶格常数随退火时间的增长而减小.最终得到了高质量的YBCO涂层导体,超导转变宽度(ΔT_c)为1.6K,临界电流密度(J_c)达1.3MA/cm~2(77K,SF).
It was reported the results for development of YBCO superconducting films on the cube textured CeO_2/YSZ/Y_2O_3/NiW substrates using continuous pulsed laser deposition (PLD). Studied the influence of the PLD conditions as substrate temperature, YBCO layer thickness and annealing time on the texture, morphological features and c-axis parameter of the films. The results showed that the a-axis oriented grains grow at lower temperature, the surface morphology become poor with increasing thickness of the film, c-axis lattice parameter expansion can be caused by decreasing the annealing time. Under the optimized conditions, the high-quality YBCO coated conductor,with transition width ΔT_c of 1.6K and J_c up to 1.3MA/cm~2 (77K,SF),is obtained.
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