Strong magnetic x-ray dichroism in 2p absorption spectra of 3d transition-metal ions.
Strong magnetic x-ray dichroism in 2p absorption spectra of 3d transition-metal ions.
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DOI：
10.1103/physrevb.43.13401
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发表时间：
1991-06
期刊：
影响因子：
--
通讯作者：
G. Laan;B. Thole
中科院分区：
文献类型：
--
作者：
G. Laan;B. Thole
通过晶体场对称性的原子计算，我们发现磁有序 3d 过渡金属离子的 2p X 射线吸收边具有非常强的圆二色性和线性二色性。光谱形状随着基态的特征而发生巨大变化，基态的特征是由晶体场的存在以及交换和 3d 自旋轨道相互作用的相对大小决定的。左圆偏振和右圆偏振的 2p 吸收积分强度的差异提供了球对称性和晶体场对称性中 3d 自旋轨道耦合的测量。各向异性支化比取决于自旋轨道相互作用和交换相互作用的 Van Vleck 贡献。我们的计算结果为研究具有局域 3d 电子的材料的磁 X 射线二色性提供了基础。
From atomic calculations in crystal-field symmetry we find a very strong circular and linear dichroism in the 2p x-ray absorption edges of magnetically ordered 3d transition-metal ions. The spectral shape changes drastically with the character of the ground state, which is determined by the presence of a crystal field, and the relative magnitudes of the exchange and 3d spin-orbit interaction. The difference in integrated intensity of the 2p absorption for left- and right-circular polarization provides a measure for the 3d spin-orbit coupling in spherical and crystal-field symmetry. The anisotropic branching ratio depends on the spin-orbit interaction and the Van Vleck contribution of the exchange interaction. The results of our calculations provide a basis for the study of magnetic x-ray dichroism on materials with localized 3d electrons.