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激光分子束外延制备的BaTiO₃及c取向YBa₂Cu₃O_7-δ薄膜的生长模式

GROWTH MODES OF BaTiO\-3 AND c AXIS ORIENTED Y\-1Ba\-2Cu\-3O\-\{7-δ\} THIN FILMS MADE BY L MBE

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【作者】马昆；王会生；吕惠宾；崔大复；周岳亮；陈正豪；胡文斐；陈莺飞；李林；杨国桢；

【Author】 Ma Kun\+a\ \ Wang Hui sheng\+b\ \ Lu Hui bin\+b\ \ Cui Da fu\+b Zhou Yue liang\+b\ \ Chen Zheng hao\+b\ \ Hu Wen fei\+a\ \ Chen Ying fei\+a Li Lin\+a\ \ Yang Guo zhen\+b \+a\ State Key Laboratory for Superconductors, \+b\ The Laboratory for Opt

【机构】国家重点超导实验室；中国科学院物理所&凝聚态物理中心!北京100080；光学实验室；中国科学院物理所&凝?；

【摘要】用反射式高能电子衍射（ＲＨＥＥＤ）和原子力显微镜（ＡＦＭ）研究激光分子束制备的铁电ＢａＴｉＯ３和高Ｔｃ超导ｃ取向Ｙ１Ｂａ２Ｃｕ３Ｏ７薄膜的生长模式，ＢＴＯ铁电薄膜是原子级平整的层状生长模式；ｃ取向ＹＢＣＯ超导薄膜是ＳＫ生长模式当薄膜厚度小于５个原胞时，层状生长，然后是台阶岛状生长．处理ＳｒＴｉＯ３基片表面可以改变ｃ取向ＹＢＣＯ薄膜的生长模式更多还原

【Abstract】 The Growth modes of BaTiO\-3(BTO) and c Y\-1Ba\-2Cu\-3O\-\{7-δ\}(YBCO) thin films on the SrTiO\-3 substrates made by L MBE have been studied with RHEED and AFM. The intensity oscillation curves of RHEED have shown that the former grew with atomic layer by layer mode; but the latter grew with the Stranski Krastanov mode. Appropriate treatments of STO can change the morphology, structure and composition of STO surface, consequently change the growth mode of c YBCO to the step flow mode.更多还原