Temperature dependence of growth orientation of YBa₂Cu₃O_6+δ film on NdGaO₃ using liquid-phase epitaxy

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• 作者：Hiroyuki Nasu ; Yasuji Yamada ; Shugo Kubo
• 关键词：A1. Orientation ; A2. Growth from solution ; A3. Liquid-phase epitaxy ; B1. Cuprates ; B2. Oxide superconducting materials
• 刊名：Journal of Crystal Growth
• 出版年：2008
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：15 June 2008
• 卷：310
• 期：13
• 页码：3214-3218
• 文件大小：401 K

摘要

Using a liquid-phase epitaxy method, YBa₂Cu₃O_6+δ (YBCO) films were grown on NdGaO₃ (NGO) substrates. Their growth orientation was investigated as a function of growth temperature. At growth temperatures higher than 980 °C, c-axis (YBCO0 0 1)-oriented films that were perpendicular to the substrate surface were obtained on both NGO(1 1 0) and NGO(0 0 1) substrates. At growth temperatures lower than 970 °C, YBCO films tended to grow with an a-axis orientation on NGO(1 1 0) substrates and a-/c-axis mixture film on NGO(0 0 1) substrates. It is difficult to explain these growth behaviors merely by the thermal expansion difference between the substrate and the film, supersaturation effect reported or strain energy caused by the misfit. Therefore, another factor affecting YBCO orientation with growth temperature and substrate orientation should be superimposed on these apparent factors.