HRXRD analysis for YBa2Cu3O7−x deposited on {001} LaAlO3
(General Research Institute for Nonferrous Metals, Beijing 100088, China)
Abstract: 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, á100ñYBCO//á100ñLAO besides 2% {001}YBCO//{001}LAO, á110ñYBCO//á100ñLAO. The out-plane alignment of YBCO is some spreading (the breadth is 0.75°). There are 90°±0.65°á110ñ twin domains in the film, which is caused by the high local stress and stress difference between á100ñ and á010ñ during the tetragonal to orthorhombic phase transition.
Key words: YBa2Cu3O7−x; crystalline alignment; twin domain; phase transition; superconducting film