Magnetic circular dichroism in Fe 2p resonant photoemission of magnetite -: art. no. 085107
Magnetic circular dichroism in Fe 2p resonant photoemission of magnetite -: art. no. 085107
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DOI：
10.1103/physrevb.69.085107
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发表时间：
2004-02-01
影响因子：
3.7
通讯作者：
Chen, CT
中科院分区：
文献类型：
--
作者：
Chen, J;Huang, DJ;Chen, CT
测量的磁性圆二色性在Fe 2 p共振光电子能谱和计算的基础上的全多重态集团模型揭示了Fe 3 O 4的电子结构的参数。通过对磁性圆二色光谱数据的分析，得到了Fe 3 O 4中3d电子的库仑能U-dd、电子从O2 p到Fe 3d的电荷转移能Δ以及Fe 3d与O2 p在不同Fe离子位的杂化强度。Fe 3+离子的电荷转移能明显小于Fe 2+离子。我们确定了每个Fe离子位点的低位多重态的能量位置。这些能量位置的Fe 3+离子网站是1.5-2.5 eV高于从能带结构计算得到的。我们的计算还表明，在结合能大于10 eV的光电子能谱权重是相当大的，在带结构计算的结果相比。我们的研究结果表明，Fe 3 O 4是一个系统，具有较强的电子-电子相互作用。
Measurements of magnetic circular dichroism in Fe 2p resonant photoemission and calculations based on a full-multiplet cluster model reveal the parameters of the electronic structure of Fe3O4. We obtained on-site Coulomb energy U-dd of 3d electrons, charge-transfer energy Delta which is defined as the energy required to transfer an electron from O 2p to Fe 3d, and the hybridization strength between Fe 3d and O 2p at different Fe ion sites of Fe3O4 by analyzing the data of magnetic circular dichroism. The charge-transfer energy of Fe3+ ions was found to be significantly smaller than that of Fe2+ ions. We determined the energy positions of the low-lying multiplets of each Fe ion site. These energy positions for Fe3+ ion sites are 1.5-2.5 eV higher than those obtained from band-structure calculations. Our calculations also show that the photoemission spectral weight in binding energy bigger than 10 eV is substantial, in contrast to the results of band-structure calculations. Our findings conclude that Fe3O4 is a system with strong electron-electron interactions.