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Uniaxial stress influence on electrical conductivity of thin epitaxial lanthanum-strontium manganite films
Thin Solid Films ( IF 2.0 ) Pub Date : 2013-07-01 , DOI: 10.1016/j.tsf.2013.05.127
V. Stankevič , Č. Šimkevičius , S. Balevičius , N. Žurauskienė , P. Cimmperman , A. Abrutis , V. Plaušinaitienė
Thin Solid Films ( IF 2.0 ) Pub Date : 2013-07-01 , DOI: 10.1016/j.tsf.2013.05.127
V. Stankevič , Č. Šimkevičius , S. Balevičius , N. Žurauskienė , P. Cimmperman , A. Abrutis , V. Plaušinaitienė
article i nfo This is a study of the influence of external uniaxial mechanical strains on the transport properties of thin ep- itaxial La0.83Sr0.17MnO3 (LSMO) films. Our measurements were carried out using standard isosceles triangle-shaped cantilever. Films which were tensed in-plane or compressed or were subjected to both ten- sion and compression strains were grown onto SrTiO3 (STO), LaAlO3 (LAO) and (001) NdGaO3 (NGO) sub- strates, respectively. It was found that for thin films (less than 100 nm), the uniaxial compression of such films which were initially tensed in-plane (grown onto STO substrates) produces a decrease of their resis- tance, whereas the compression of initially compressed films (on LAO substrates) produces an increase of the films' resistance. The same results were obtained for LSMO films grown onto (001) NGO substrates when they were compressed along the (010) and (100) directions, respectively. For thicker films (more than 100 nm), the resistance behavior after uniaxial compression was found to be identical to that produced by hydrostatic compression, namely, the resistance decreases irrespective of the substrate. These experi- ments also reveal an increase of resistance and a shift of metal-insulator transition temperature Tm to lower temperatures corresponding to a decrease of the film thickness. The occurrence of this effect is also in- dependent of the kind of substrate used. Thus it was concluded that the influence of film thickness on its re- sistance as well as on the behavior of such films while under external uniaxial compression cannot be explained fully by only the presence of residual stress in these films. A possible reason is that the inhomoge- neous distribution of the mechanical stresses in the films can lead to the appearance of two conductivity phases, each having a different mechanism. The results which were obtained when these films were subjected to hydrostatic compression were also explained by this model.
中文翻译:
单轴应力对外延镧锶锰氧化物薄膜电导率的影响
文章信息 这是一项关于外部单轴机械应变对薄外延 La0.83Sr0.17MnO3 (LSMO) 薄膜传输特性影响的研究。我们的测量是使用标准等腰三角形悬臂进行的。分别在 SrTiO3 (STO)、LaAlO3 (LAO) 和 (001) NdGaO3 (NGO) 衬底上生长在平面内张紧或压缩或同时受到拉伸和压缩应变的薄膜。发现对于薄膜(小于 100 nm),这种最初在平面内张紧(生长到 STO 基板上)的薄膜的单轴压缩会导致它们的电阻降低,而最初压缩的薄膜的压缩(在 LAO 基板上)会增加薄膜的电阻。当 LSMO 薄膜分别沿 (010) 和 (100) 方向压缩时,在 (001) NGO 基板上生长的 LSMO 薄膜获得了相同的结果。对于较厚的薄膜(超过 100 nm),发现单轴压缩后的阻力行为与静水压缩产生的阻力行为相同,即无论基材如何,阻力都会降低。这些实验还揭示了电阻的增加和金属-绝缘体转变温度 Tm 向较低温度的移动,对应于薄膜厚度的减小。这种效应的发生也与所用基材的种类无关。因此得出的结论是,薄膜厚度对其电阻的影响以及在外部单轴压缩下对此类薄膜的行为的影响不能仅用这些薄膜中存在的残余应力来完全解释。一个可能的原因是薄膜中机械应力的不均匀分布会导致两个导电相的出现,每个相都有不同的机制。该模型也解释了当这些薄膜经受静水压压缩时获得的结果。
更新日期:2013-07-01
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
单轴应力对外延镧锶锰氧化物薄膜电导率的影响
文章信息 这是一项关于外部单轴机械应变对薄外延 La0.83Sr0.17MnO3 (LSMO) 薄膜传输特性影响的研究。我们的测量是使用标准等腰三角形悬臂进行的。分别在 SrTiO3 (STO)、LaAlO3 (LAO) 和 (001) NdGaO3 (NGO) 衬底上生长在平面内张紧或压缩或同时受到拉伸和压缩应变的薄膜。发现对于薄膜(小于 100 nm),这种最初在平面内张紧(生长到 STO 基板上)的薄膜的单轴压缩会导致它们的电阻降低,而最初压缩的薄膜的压缩(在 LAO 基板上)会增加薄膜的电阻。当 LSMO 薄膜分别沿 (010) 和 (100) 方向压缩时,在 (001) NGO 基板上生长的 LSMO 薄膜获得了相同的结果。对于较厚的薄膜(超过 100 nm),发现单轴压缩后的阻力行为与静水压缩产生的阻力行为相同,即无论基材如何,阻力都会降低。这些实验还揭示了电阻的增加和金属-绝缘体转变温度 Tm 向较低温度的移动,对应于薄膜厚度的减小。这种效应的发生也与所用基材的种类无关。因此得出的结论是,薄膜厚度对其电阻的影响以及在外部单轴压缩下对此类薄膜的行为的影响不能仅用这些薄膜中存在的残余应力来完全解释。一个可能的原因是薄膜中机械应力的不均匀分布会导致两个导电相的出现,每个相都有不同的机制。该模型也解释了当这些薄膜经受静水压压缩时获得的结果。