前驱液成分对TFA-MOD法制备YBa_2Cu_3O_(7-x)薄膜超导性能的影响  

Effect of precursor composition on superconductivity properties of YBCO film prepared by TFA-MOD method

作　　者：丁发柱[1] 古宏伟[1] 

机构地区：[1]中国科学院电工研究所应用超导重点实验室,北京100190

出　　处：《物理学报》2010年第11期8142-8147,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50672011)资助的课题~~

摘　　要：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YBa2Cu3O7-x(YBCO)超导薄膜.通过改变前驱液的成分,研究了金属元素的不同化学计量比对YBCO薄膜的结构和性能的影响.结果表明,按照钇盐Y(CH3COO)3与钡盐Ba(CH3COO)2的比例为Y∶Ba=1∶1.5时所制备的YBCO薄膜的临界电流密度比严格按化学计量比Y/Ba=1/2制备的YBCO薄膜增大20%,达到5.0MA/cm2(77K,0T).由X射线衍射分析得知,样品中所生成的杂质相Y2Cu2O5可能起到了磁通钉扎的作用从而提高了YBCO薄膜的临界电流密度.The YBCO films were prepared on LAO single crystal by TFA-MOD process.The structure and properties of YBCO films were investigated through changing the Y123 stoichiometry.It is found that higher JC values in self-filed of YBCO films are achieved by using the starting solution with the Ba∶ Y ratio of 1.5∶ 1.Xray diffraction analysis revealed that Y2Cu2O5 phases are formed in the final YBCO films,which may lead to very effective vortex pinning and then enhance the JC of YBCO films.

关 键 词：三氟乙酸盐-金属有机沉积 钇钡铜氧薄膜 前驱液成分 磁通钉扎 

分 类 号：TM26[一般工业技术—材料科学与工程]