Spatial distribution of transferred charges across the heterointerface between perovskite transition metal oxides LaNiO3 and LaMnO3
Spatial distribution of transferred charges across the heterointerface between perovskite transition metal oxides LaNiO3 and LaMnO3
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DOI：
10.1063/1.4944418
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发表时间：
2016-03-14
影响因子：
4
通讯作者：
Kumigashira, Hiroshi
中科院分区：
文献类型：
--
作者：
Kitamura, Miho;Horiba, Koji;Kumigashira, Hiroshi
为了研究钙钛矿型过渡金属氧化物LaNiO_3(LNO)和LaMnO_3(LMO)之间的界面电荷转移现象，我们对LNO/LMO多层膜进行了原位X射线吸收光谱(XAS)测量。Ni-L-2，L-3和Mn-L-2，L-3的XAS谱清楚地表明在界面区发生了从Mn到Ni离子的电子转移。对这些XAS谱的厚度依赖关系的详细分析表明，界面上转移电荷的空间分布在两个组成层之间有很大的不同。观察到的空间分布可能是用电荷扩散模型来描述的，该模型处理了相邻过渡金属离子之间的转移积分和库仑相互作用，而不是托马斯-费米屏蔽模型。(C)2016 AIP出版有限责任公司。
To investigate the interfacial charge-transfer phenomena between perovskite transition metal oxides LaNiO3 (LNO) and LaMnO3 (LMO), we have performed in situ x-ray absorption spectroscopy (XAS) measurements on LNO/LMO multilayers. The Ni-L-2,L-3 and Mn-L-2,L-3 XAS spectra clearly show the occurrence of electron transfer from Mn to Ni ions in the interface region. Detailed analysis of the thickness dependence of these XAS spectra has revealed that the spatial distribution of the transferred charges across the interface is significantly different between the two constituent layers. The observed spatial distribution is presumably described by the charge spreading model that treats the transfer integral between neighboring transition metal ions and the Coulomb interaction, rather than the Thomas-Fermi screening model. (C) 2016 AIP Publishing LLC.