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Crossover between distinct symmetries in solid solutions of rare earth nickelates
APL Materials ( IF 6.1 ) Pub Date : 2021-08-30 , DOI: 10.1063/5.0057216
Jennifer Fowlie 1 , Bernat Mundet 1, 2 , Constance Toulouse 3, 4 , Alexander Schober 3 , Mael Guennou 3, 4 , Claribel Domínguez 1 , Marta Gibert 5 , Duncan T. L. Alexander 2 , Jens Kreisel 4 , Jean-Marc Triscone 1
Affiliation  

A strong coupling of the lattice to functional properties is observed in many transition metal oxide systems, such as the ABO3 perovskites. In the quest for tailor-made materials, it is essential to be able to control the structural properties of the compound(s) of interest. Here, thin film solid solutions that combine NdNiO3 and LaNiO3, two materials with the perovskite structure but distinct space groups, are analyzed. Raman spectroscopy and scanning transmission electron microscopy are combined in a synergistic approach to fully determine the mechanism of the structural crossover with chemical composition. It is found that the symmetry transition is achieved by phase coexistence in a way that depends on the substrate selected. These results carry implications for analog-tuning of physical properties in future functional materials based on these compounds.

中文翻译:

稀土镍酸盐固溶体中不同对称性之间的交叉

在许多过渡金属氧化物系统中观察到晶格与功能特性的强耦合,例如 ABO 3钙钛矿。在寻求定制材料的过程中,必须能够控制目标化合物的结构特性。在这里,结合 NdNiO 3和 LaNiO 3 的薄膜固溶体,分析了两种具有钙钛矿结构但空间群不同的材料。拉曼光谱和扫描透射电子显微镜以协同方法相结合,以充分确定结构交叉与化学成分的机制。发现对称转变是通过相共存实现的,这种方式取决于所选择的衬底。这些结果对基于这些化合物的未来功能材料中物理特性的模拟调整具有重要意义。
更新日期:2021-08-31
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