Comparison of Ba_2YCu_3O_7−δ thin films grown on various perovskite substrates by coevaporation
Comparison of Ba_2YCu_3O_7−δ thin films grown on various perovskite substrates by coevaporation
复制标题
DOI：
10.1557/jmr.1992.2650
复制
发表时间：
1992-10
影响因子：
2.7
通讯作者：
J. Phillips;M. Siegal;R. B. Dover;T. Tiefel;J. H. Marshall;C. Brandle;G. Berkstresser;A. Strauss;R. E. Fahey;S. Sengupta;A. Cassanho;H. Jenssen
中科院分区：
文献类型：
--
作者：
J. Phillips;M. Siegal;R. B. Dover;T. Tiefel;J. H. Marshall;C. Brandle;G. Berkstresser;A. Strauss;R. E. Fahey;S. Sengupta;A. Cassanho;H. Jenssen
比较了BaF_2法在钙钛矿LaAlO_3、LaGaO_3、NdAlO_3、NdGaO_3、LiBaF_3和SrTiO_3（100）衬底上生长的Ba_2YCu_3O_7−δ (BYCO)薄膜的质量。薄膜是通过Y、Cu和BaF_2的共蒸发生长的，然后进行两阶段退火。退火的高温阶段，即BYCO晶体结构和形貌发育的阶段，发生了变化。与其他衬底相比，LaAlO_3和SrTiO_3在电学和结构上都支持更好的薄膜。在这些氧化物中，NdGaO_3支持的薄膜最差，而LiBaF_3上的薄膜是不导电的。这些结果强调了化学相容性在确定潜在基底材料的适用性方面的压倒一切的重要性。除非满足这个条件，否则格匹配问题就不重要了。
We have compared the quality of Ba_2YCu_3O_7−δ (BYCO) films grown by the BaF_2 process on (100) substrates of the perovskites LaAlO_3, LaGaO_3, NdAlO_3, NdGaO_3, LiBaF_3, and SrTiO_3. The films were grown by coevaporation of Y, Cu, and BaF_2 followed by a two-stage anneal. The high temperature stage of the anneal, the part of the process during which the BYCO crystal structure and morphology develop, has been varied. LaAlO_3 and SrTiO_3 support much better films, both electrically and structurally, than the other substrates. Of the oxides, NdGaO_3 supports the worst films, while films on LiBaF_3 are nonconducting. These results emphasize the overriding importance of chemical compatibility in determining the suitability of a potential substrate material. Unless this criterion is satisfied, the issue of lattice matching is unimportant.