Weak anisotropic x-ray magnetic linear dichroism at the Eu M4,5 edges of ferromagnetic EuO(001): evidence for 4f-state contributions.
Weak anisotropic x-ray magnetic linear dichroism at the Eu M4,5 edges of ferromagnetic EuO(001): evidence for 4f-state contributions.
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铁磁 EuO(001) 的 Eu M4,5 边缘处的弱各向异性 X 射线磁线性二色性：4f 态贡献的证据。
DOI：
10.1103/physrevlett.100.067403
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发表时间：
2008
影响因子：
8.6
通讯作者：
D. Schlom
中科院分区：
文献类型：
--
作者：
G. van der Laan;E. Arenholz;A. Schmehl;D. Schlom
我们在EuO（001）的Eu M4，5边观察到弱的各向异性X射线磁性线性二向色性（AXMLD），这表明4f态不是旋转不变的。AXMLD的定量协议得到多重态计算的4f状态分裂的有效立方晶体静电场。结果表明，稀土的标准模型，其中4f电子被视为核心状态，是不正确的，4f轨道的磁各向异性的贡献很弱。
We have observed a weak anisotropic x-ray magnetic linear dichroism (AXMLD) at the Eu M4,5 edges of ferromagnetic EuO(001), which indicates that the 4f states are not rotationally invariant. A quantitative agreement of the AXMLD is obtained with multiplet calculations where the 4f state is split by an effective cubic crystalline electrostatic field. The results indicate that the standard model of rare earths, where 4f electrons are treated as core states, is not correct and that the 4f orbitals contribute weakly to the magnetic anisotropy.