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Manifestation of lattice distortions in the O 1s spectra in Ca1-xSrxRuO3

机译:Ca1-xSrxRuO3的O 1s光谱中晶格畸变的表现

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We investigate the effect of temperature on the electronic and crystal structures of Ca1-xSrxRuO3 via the evolution of O 1s core level spectra as a function of temperature and composition, x. O 1s spectra of SrRuO3 exhibit a dominant sharp feature at all the temperatures with a small trace of an impurity feature at higher binding energies. The spectra of Ca doped samples, however, exhibit two distinct features. Analysis of the experimental spectral functions and the band structure results suggest that the different Madelung potentials at the two kinds of oxygen sites in the orthorhombically distorted structure lead to two distinct features in the O 1s spectra. Interestingly, the energy separation of these two features becomes smaller at low temperatures for the Ca dominated samples, suggesting significant structural modification of these samples at low temperatures. (c) 2006 Elsevier Ltd. All rights reserved.
机译:我们通过O 1s核心能级谱随温度和组成x的变化,研究温度对Ca1-xSrxRuO3电子和晶体结构的影响。在所有温度下,SrRuO3的O 1s光谱都显示出明显的明显特征,而在较高的结合能下,只有少量痕量的杂质。但是,Ca掺杂样品的光谱表现出两个不同的特征。对实验光谱函数和能带结构结果的分析表明,正交畸变结构中两种氧位处不同的马德隆势能导致O 1s光谱具有两个不同的特征。有趣的是,对于Ca为主的样品,这两个特征的能量分离在低温下会变小,这表明这些样品在低温下会发生明显的结构修饰。 (c)2006 Elsevier Ltd.保留所有权利。

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