Modeling of twinning in epitaxial (001)-oriented La0.67Sr0.33MnO3 thin films
Modeling of twinning in epitaxial (001)-oriented La0.67Sr0.33MnO3 thin films
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DOI：
10.1063/1.1914950
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发表时间：
2005-05
影响因子：
3.2
通讯作者：
N. Farag;M. Bobeth;W. Pompe;A. Romanov;J. Speck
中科院分区：
文献类型：
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作者：
N. Farag;M. Bobeth;W. Pompe;A. Romanov;J. Speck
双胞胎，即，La 1 − xSrxMnO 3薄膜在（001）取向的立方衬底上相干生长，其结构域的形成被解释为在畸变的菱形La 1 − xSrxMnO 3晶格内的剪切应变弛豫的结果。提出了一种一维周期性孪晶模型结构，并应用相干缺陷技术计算了孪晶La 1 − xSrxMnO 3薄膜的非均匀弹性应变.应变场取决于畴宽度和膜厚度的比率，并在畴边界和膜/衬底界面的三重结处表现出最大值。平衡域宽度作为膜厚度的函数，通过最小化系统的总能量，包括弹性应变和畴壁能量的贡献。从比较的理论结果与最近的电子显微镜观察孪晶的畴壁能量可以预测。从所观察到的La0.67Sr0.33MnO3薄膜中的平均畴宽来看，...
Twinning, i.e., the formation of structural domains, in La1−xSrxMnO3 thin films, which grow coherently on (001)-oriented cubic substrates, is explained as a result of shear strain relaxation within the distorted rhombohedral La1−xSrxMnO3 crystal lattice. A one-dimensional periodic model structure of twins is proposed and the nonuniform elastic strains within twinned La1−xSrxMnO3 films are calculated by applying the coherency-defect technique. The strain field depends on the ratio of the domain width and film thickness and exhibits maxima at the triple junctions of the domain boundaries and the film/substrate interface. The equilibrium domain width is derived as a function of the film thickness by minimizing the total energy of the system including contributions from elastic strain and domain-wall energy. From comparison of the theoretical results with recent electron microscope observations of twins the domain-wall energy can be predicted. From the observed average domain width in La0.67Sr0.33MnO3 films, ...