An investigation of uranium M4,5 edge magnetic X-ray circular dichroism in US
An investigation of uranium M4,5 edge magnetic X-ray circular dichroism in US
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美国铀M4,5边缘磁X射线圆二色性研究
DOI：
10.1088/0953-8984/7/48/021
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
G. Laan
中科院分区：
文献类型：
--
作者：
S. Collins;D. Laundy;C. Tang;G. Laan
通过监测铀M4.5边缘的荧光信号，测量了铁磁一硫化铀晶体的磁X射线圆二色性（MXCD）。尽管相当大的吸收修正，我们已经得到了一个精确的二向色性分支比的值，这是比较与总和规则的预测。我们发现，在立方3d过渡金属的情况下，磁偶极子项（Tz）可以忽略不计，它的贡献的二色性信号在本情况下是大于自旋极化，（Sz）。的二色性光谱显示出相当多的结构比那些从反铁磁锕系化合物的共振磁衍射，并被发现是在良好的定性与原子计算的5f2和5f3配置。
Magnetic X-ray circular dichroism (MXCD) has been measured in a ferromagnetic uranium monosulphide crystal by monitoring the fluorescence signal over the uranium M4.5 edges. Despite sizeable absorption corrections, we have obtained a precise value of the dichroic branching ratio, which is compared with sum-rule predictions. We find that, in contrast to the case of cubic 3d transition metals where the magnetic dipole term (Tz) can be neglected, its contribution to the dichroism signal in the present case is larger than that of the spin polarization, (Sz). The dichroism spectrum is shown to exhibit considerably more structure than those of resonant magnetic diffraction from antiferromagnetic actinide compounds, and is found to be in good qualitative agreement with atomic calculations of 5f2 and 5f3 configurations.