(001)SrTiO_3衬底上的Ba_(0.7)Sr(0.3)TiO_3/YBa_2Cu_3O_(7-δ)外延生长薄膜的界面结构研究  

Investigation on interface structure of Ba_(0.7)Sr_(0.3)TiO_3/YBa_2Cu_3O_(7-δ) epitaxial films on (001) SrTiO_3 substrate

作　　者：齐笑迎[1] 杨浩[2] 孔祥[1] 胡桂青[1] 段晓峰[1] 赵柏儒[2] 

机构地区：[1]中国科学院电子显微镜重点实验室中国科学院物理研究所凝聚态物理中心 [2]国家超导重点实验室中国科学院物理研究所凝聚态物理中心,北京100080

出　　处：《电子显微学报》2004年第2期152-158,共7页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.60371030).

摘　　要：本文利用透射电子显微学和高分辨电子显微学研究了SrTiO3衬底上的Ba0 7Sr0 3TiO3 YBa2Cu3O7-δ(BST YBCO)外延薄膜的界面结构。结果表明在BST YBCO界面形成了阶梯(step terrace)结构,同时BST外延膜生长良好。在YBCO薄膜表面形成梯形结构后,也可能按照台阶生长(step flow)模型生长出完好的BST薄膜。Interface structures of Ba_(0.7)Sr_(0.3)TiO_3/YBa_2Cu_3O_(7-δ)(BST/YBCO) films epitaxially grown on (001) SrTiO_3 substrate by DC magnetron sputtering and pulsed laser deposition were investigated by transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). Step-terrace structure was formed at the interfaces of BST/YBCO. Investigation showed that a perfect single crystalline epilayer of BST was achieved. Strained-layer step-flow growth mechanism was proposed for BST epilayer grown on YBCO surface with a mismatch between the BST and the YBCO epilayers.

关 键 词：高分辨电子显微学 外延薄膜 界面结构 铁电-超导复合材料 钛酸锶材料 结构参数 

分 类 号：TN304.055[电子电信—物理电子学]