PrVO3外延薄膜的结构表征
Structural characterization of PrVO3 epitaxial thin films
摘要：
稀土钙钛矿氧化物构成了一个广泛的材料家族，其功能特性与其晶体结构强烈耦合。在这里，我们报告的实验结果外延PrVO 3沉积在SrTiO 3单晶衬底上的脉冲激光沉积。结合先进的结构表征工具，我们观察到在STO上生长的PVO非弛豫薄膜结构具有两种取向畴，其外延关系为：（i）PrVO 3 [110]o//SrTiO 3 [001]c和PrVO 3 [001]o//SrTiO 3 [100]c，（ii）PrVO 3 [110]o//SrTiO 3 [001]c和PrVO 3 [001]o//SrTiO 3 [010]c。我们还测量了倒易空间图。从这些结果中，我们已经确定，STO上的PVO薄膜外延施加降低的PVO结构对称性从正交（Pbnm）单斜（P21/m）。我们表明，由衬底引起的标称应变是恒定的，得到的薄膜结构取决于生长氧和温度。因此，通过精细地控制沉积条件，我们可以调节PrVO 3薄膜所经历的应变。这些结果显示了衬底失配的替代方案作为控制PVO膜的应变和结构的路径。
英文摘要：
Rare earth perovskite oxides constitute a wide family of materials presenting functional proper- ties strongly coupled to their crystalline structure. Here, we report on the experimental results on epitaxial PrVO3 deposited on SrTiO3 single crystal substrates by pulsed laser deposition. By com- bining advanced structural characterization tools, we have observed that the PVO unrelaxed film structure grown on STO, is characterized by two kinds of oriented domains whose epitaxial relations are: (i) PrVO3[110]o//SrTiO3[001]c and PrVO3[001]o//SrTiO3[100]c, (ii) PrVO3[110]o//SrTiO3[001]c and PrVO3[001]o//SrTiO3[010]c. We have also measured reciprocal space maps. From these results, we have determined that the PVO film epitaxy on STO imposes a lowering of the PVO structure symmetry from orthorhombic (Pbnm) to monoclinic (P21/m). We show, the nominal strain induced by the substrate being constant, that the obtained film structure depends on both growth oxygen and temperature. Thus, by finely controlling the deposition conditions, we could tune the strain experienced by PrVO3 thin film. These results show an alternative to substrate mismatch as a path to control the strain and structure of PVO films.
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