Geometric-shape-dependent structural transition behavior in (110) SrRuO3 epitaxial thin films
Geometric-shape-dependent structural transition behavior in (110) SrRuO3 epitaxial thin films
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DOI：
10.1063/1.4716029
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发表时间：
2012-05-01
影响因子：
3.2
通讯作者：
Shimakawa, Yuichi
中科院分区：
文献类型：
--
作者：
Kan, Daisuke;Shimakawa, Yuichi
我们进行了结构研究的外延生长的SrRuO 3薄膜的几何形状的一维条纹和二维层，侧重于如何影响的几何形状的结构转变行为从高温的伪立方相到低温的正交相。从膜的面外晶格参数的温度依赖性，我们发现，在条形膜中的结构转变发生在一个较窄的温度范围内相比，在层状膜。详细的倒易空间映射表明，在条纹状薄膜中，由于应变沿[1-10]（ortho_SRO）方向沿着弛豫，在正交相中形成了孪晶，因此相变发生在较窄的温度范围内。相反，层状膜是完全应变的，并且在整个过渡区保持单一的结晶域。结果表明，应变对薄膜结构转变行为的影响与薄膜的几何形状密切相关。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4716029]
We performed structural investigations of epitaxially grown SrRuO3 films with geometric shapes of one-dimensional stripes and a two-dimensional layer, focusing on how the geometric shapes affect the structural transition behavior from the high-temperature pseudo-cubic phase to the low-temperature orthorhombic one. From the temperature dependence of the out-of-plane lattice parameter of the films, we found that the structural transition in the stripe-shape film occurs in a narrower temperature range as compared to that in the layer-shape film. Detailed reciprocal space mappings reveal that in the stripe-shape film, crystallographic twins are formed in the orthorhombic phase due to the strain relaxation along the [1-10](ortho_SRO) direction and as a consequence the transition occurs in the narrower temperature range. In contrast, the layer-shape film is fully strained and maintains a single crystallographic domain across the transition. The results indicate that the strain effect on the structural transition behavior is strongly dependent on the geometric shapes of the films. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4716029]