La1−xAXMnO3 (A=Ca, Sr)外延薄膜的失配调节

O.I Lebedev, G Van Tendeloo, S Amelinckx
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引用次数: 5

摘要

在衬底上外延生长的La1−xAxMnO3 (A=Ca, Sr)薄膜提供了一个独特的机会,通过与衬底晶格不匹配产生不同的应力场来诱导不同类型的钙钛矿变形。La0.67Ca0.33MnO3薄膜在失配度为1.54% (aF<aS)的SrTiO3(100)衬底上表现出显著的微观结构。在与SrTiO3衬底直接接触时,形成了一层薄的完全相干的La1−xCaxMnO3层,其单斜对称性略有扭曲。在第一层的上面生长第二层较厚的层;具有柱状组织。对于LaAlO3(001)衬底上的外延La0.7Sr0.3MnO3(LSMO)薄膜,薄膜中应力(2.77%,aF>aS)的演变是薄膜厚度和热处理的函数。薄膜(20nm)被弹性地容纳。在较厚的薄膜中,应力在退火后通过形成具有边缘特征的错配位错网络而部分减轻。对于SrTiO3(100)上的外延La0.9Sr0.1MnO3薄膜,小的失配(aF≈aS)要么是纯弹性的(薄膜),要么是通过形成周期性的微孪晶来适应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Misfit accommodation of epitaxial La1−xAXMnO3 (A=Ca, Sr) thin films

Thin film of La1−xAxMnO3 (A=Ca, Sr) grown epitaxially on substrates give a unique opportunity to induce different types of perovskite distortions by creating different stress fields resulting from lattice mismatch with the substrate. Thin films of La0.67Ca0.33MnO3 on a SrTiO3(100) substrate, with a misfit of 1.54% (aF<aS), exhibit a remarkable microstructure. In direct contact with the SrTiO3 substrate a thin perfectly coherent La1−xCaxMnO3 layer, which exhibits a slightly distorted monoclinic symmetry, is formed. On top of this first layer a second thicker layer is grown; it has a columnar microstructure. For epitaxial La0.7Sr0.3MnO3(LSMO) films on a LaAlO3(001) substrate the evolution of stress (2.77%, aF>aS) in the film is function of film thickness and thermal treatment. Thin films (20 nm) are accommodated elastically. In thicker films the stress is partially relieved after annealing by the formation of a network of misfit dislocations with an edge character. For epitaxial La0.9Sr0.1MnO3 films on SrTiO3 (100) the small misfit (aFaS) is accommodated either purely elastically (for thin film) or by the formation of periodic microtwins.

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