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The Misfit Dislocation Core Phase in Complex Oxide Heteroepitaxy

机译：复杂氧化物异质外延错配位错核心相

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摘要

Misfit dislocations form self-organized nanoscale linear defects exhibiting their own distinct structural, chemical, and physical properties which, particularly in complex oxides, hold a strong potential for the development of nanodevices. However, the transformation of such defects from passive into potentially active functional elements necessitates a deep understanding of the particular mechanisms governing their formation. Here, different atomic resolution imaging and spectroscopic techniques are combined to determine the complex structure of misfit dislocations in the perovskite type La0.67Sr0.33MnO3/LaAlO3 heteroepitaxial system. It is found that while the position of the film-substrate interface is blurred by cation intermixing, oxygen vacancies selectively accumulate at the tensile region of the dislocation strain field. Such accumulation of vacancies is accompanied by the reduction of manganese cations in the same area, inducing chemical expansion effects, which partly accommodate the dislocation strain. The formation of oxygen vacancies is only partially electrically compensated and results in a positive net charge q approximate to +0.3 +/- 0.1 localized in the tensile region of the dislocation, while the compressive region remains neutral. The results highlight a prototypical core model for perovskite-based heteroepitaxial systems and offer insights for predictive manipulation of misfit dislocation properties.
机译：错位错形成自组织的纳米级线性缺陷，这些缺陷表现出它们自己独特的结构，化学和物理特性，尤其是在复合氧化物中，具有发展纳米器件的强大潜力。但是，将此类缺陷从被动功能元素转换为潜在功能元素需要深入了解控制其形成的特定机制。在这里，结合不同的原子分辨率成像和光谱技术来确定钙钛矿型La0.67Sr0.33MnO3 / LaAlO3异质外延系统中错配位错的复杂结构。已经发现，尽管膜-基底界面的位置由于阳离子的混合而模糊，但是氧空位选择性地聚集在位错应变场的拉伸区域。空位的这种累积伴随着相同区域中锰阳离子的减少，从而引起化学膨胀效应，其部分适应了位错应变。氧空位的形成仅被部分电补偿，并且导致正净电荷q大约位于位错的拉伸区域中，位于+0.3 +/- 0.1，而压缩区域保持中性。结果突出了基于钙钛矿的异质外延系统的原型核心模型，并为错配位错特性的预测性操纵提供了见识。

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