Zn^(2+)掺杂的YBCO薄膜的超导性能研究  

Superconducting properties of Zn^(2+)-doped YBCO thin films

作　　者：雷黎[1] 赵高扬[1,2] 徐慧[2] 

机构地区：[1]西安理工大学现代分析测试中心,陕西西安710048 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《功能材料》2011年第11期2116-2118,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51072163);高等学校博士学科点专项科研基金资助项目(20096118110002)

摘　　要：采用溶胶-凝胶法在LaAlO3(LAO)单晶衬底上制备了Zn2+掺杂的YBCO薄膜,用X射线衍射(XRD)、高分辨透射电子显微镜(HRTEM)以及标准四引线法分别研究了Zn2+掺杂的YBCO薄膜的微观结构、生长取向以及超导性能。结果表明,随Zn2+掺杂浓度的增大薄膜的临界电流密度提高,而临界转变温度下降、临界转变温区变宽;但当掺杂量>0.5%(摩尔分数)时,会影响YBCO的c轴取向生长,导致超导性能变差。通过优化掺杂比例后得到Zn2+掺杂0.5%(摩尔分数)的YBCO薄膜具有最好的综合超导性能,其TC为91.3K,ΔT为1.1K,Jc约为1.54MA/cm2(77K,0T)。Zn2＋-doped YBCO thin films were prepared on LaAlO3（LAO） single-crystal substrates by sol-gel process.The microstructure and growth orientation of the Zn2＋-doped YBCO thin films were analyzed by X-ray diffraction（XRD） and transmission electron microscopy（TEM） respectively.The standard four-probe method was used to measure the superconducting properties of the pure and doped YBCO thin films.The results show that the critical current density Jc of the Zn^2＋-doped YBCO films was improved with the increase of Zn2＋ concentration,although critical transition temperature TC was decreased and transition width ΔT was broadened.When the Zn^2＋ doping percentage is over 0.5mol%,the YBCO films exhibit deteriorated superconducting properties due to bad c-axis growth orientation.It is found that YBCO film doped with 0.5mol% Zn^2＋ show the best superconducting performance with TC of 91.3K,ΔT of 1.1K and Jc of 1.54MA/cm2（77K,0T）.

关 键 词：YBCO薄膜 溶胶-凝胶法 涡旋钉扎 超导性能 

分 类 号：TB43[一般工业技术] O648.16[理学—物理化学]