Ground state of ferromagnetic nickel and magnetic circular dichroism in Ni 2p core x-ray-absorption spectroscopy.
Ground state of ferromagnetic nickel and magnetic circular dichroism in Ni 2p core x-ray-absorption spectroscopy.
复制标题
铁磁镍的基态和 Ni 2p 核 X 射线吸收光谱中的磁圆二色性。
DOI：
10.1103/physrevb.43.8771
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Sawatzky
中科院分区：
文献类型：
--
作者：
Jo.;Sawatzky
在Anderson杂质模型的基础上，从三维组态相互作用的角度讨论了Ni2p-->；3Dx射线吸收谱[2p(XAS)]中铁磁性Ni的电子态和预期的磁性圆二色(MCD).该模型考虑了3D-3D和3D-2P电子相互作用产生的多重效应，以及由作用在3D自旋上的分子场近似的3D原子间交换。用普遍接受的相互作用强值表示，铁磁镍中镍原子的基态为3D10、3D9和3D8组态的叠加，其相对重量分别为15%~20%、60%~70%和15%~20%，轨道磁矩对总磁矩的贡献约为0.07mU-B。根据这些结果，我们可以解释最近在Ni2pXAS中观察到的MCD现象。
The electronic state of ferromagnetic Ni and the expected magnetic circular dichroism (MCD) in Ni 2p --> 3d x-ray-absorption spectroscopy [2p (XAS)] are discussed from a viewpoint of 3d configuration interaction on the basis of the Anderson impurity model. The model includes multiplet effects arising from 3d-3d and 3d-2p electron interactions and a 3d interatomic exchange approximated by a molecular field acting on the 3d spin. By using commonly accepted values of the interaction strengths, it is shown that the ground state of a Ni atom in ferromagnetic Ni is expressed by a superposition of 3d10, 3d9, and 3d8 configurations with relative weights of 15%-20%, 60%-70%, and 15%-20%, respectively, and with an orbital-magnetic-moment contribution of approximately 0.07-mu-B to the total moment of 0.6-mu-B. With these results, we can explain the recently observed MCD in Ni 2p XAS.