HRXRD analysis for YBa_2Cu_3O_(7-x) deposited on {001} LaAlO_3  

{001}LaAlO_3衬底上沉积YBa_2Cu_3O_(7-x)薄膜的HRXRD研究(英文)

作　　者：张华[1] 杨坚[1] 王书明[1] 刘慧舟[1] 

机构地区：[1]北京有色金属研究总院,北京100088

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第12期2633-2637,共5页中国有色金属学报（英文版）

基　　金：Project (50972019) supported by the National Natural Science Foundation of China;Project (2011CBA00105) supported by the National Basic Research Program of China

摘　　要：YBa2Cu3O7-x （YBCO） superconducting film was fabricated on {001} LaAlO3 （LAO） substrate by pulse laser deposition （PLD）, and its microstructure was examined by high resolution X-ray diffraction technology （HRXRD）, such as pole figure, rocking curve, reciprocal space mapping. The results show that the YBCO crystalline alignment is almost {001}YBCO//{001}LAO, 100YBCO//100LAO besides 2% {001}YBCO//{001}LAO, 110YBCO//100LAO. The out-plane alignment of YBCO is some spreading （the breadth is 0.75°）. There are 90°±0.65°110 twin domains in the film, which is caused by the high local stress and stress difference between 100 and 010 during the tetragonal to orthorhombic phase transition.采用脉冲激光沉积技术(PLD)在{001}LaAlO3(LAO)衬底上生长YBa2Cu3O7-x(YBCO)薄膜,并通过极图、摇摆曲线以及倒易空间图谱等高分辨X射线衍射技术(HRXRD)对其微结构进行表征。结果表明,YBCO薄膜的晶粒取向主要为{001}YBCO//{001}LAO,<100>YBCO//<100>LAO,但还有2%的{001}YBCO//{001}LAO,<110>YBCO//<100>LAO取向。摇摆曲线结果表明,YBCO的面外取向有一定的漫散(宽度为0.75°);薄膜面内存在90°±0.65°<110>孪晶畴结构,主要是由四方到正交的相变过程中较大的局部应力以及<100>和<010>方向应力差异引起的。

关 键 词：YBA2CU3O7-X crystalline alignment twin domain phase transition superconducting film 

分 类 号：TB43[一般工业技术]