Quadrupolar and dipolar contributions to x-ray magnetic circular dichroism at the Tb L3,2 edges: Experiment versus theory
Quadrupolar and dipolar contributions to x-ray magnetic circular dichroism at the Tb L3,2 edges: Experiment versus theory
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四极和偶极对 Tb L3,2 边缘处 X 射线磁圆二色性的贡献：实验与理论
DOI：
10.1063/1.1450792
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发表时间：
2002
影响因子：
3.2
通讯作者：
T. Lograsso
中科院分区：
文献类型：
--
作者：
H. Wende;Zhongrui Li;A. Scherz;G. Ceballos;K. Baberschke;A. Ankudinov;J. Rehr;F. Wilhelm;A. Rogalev;D. Schlagel;T. Lograsso
我们调查的X-射线磁性圆二色性（XMCD）在L3，2边缘使用一个单一的晶体Tb作为一个原型系统的一个元素的磁铁，以确定在二色性光谱的功能的多极性质。实验数据的高分辨率允许清楚地识别偶极（E1：2 p →5d）和四极（E2：2 p →4f）跃迁。 在从头计算的基础上，我们开发了一个简单的程序，通过从实验XMCD数据中减去自旋平均吸收光谱的导数来提取四极部分。在应用求和规则确定4f和5d矩之前，必须进行反卷积。
We investigate the x-ray magnetic circular dichroism (XMCD) at the L3,2 edges using a single crystal of Tb as a prototype system for a one-element magnet in order to ascertain the multipolar nature of the features in the dichroic spectra. The high resolution of the experimental data allows for a clear identification of the dipolar (E1: 2p→5d) and quadrupolar (E2: 2p→4f) transitions. On the basis of ab initio calculations we developed a simple procedure to extract the quadrupolar part by subtracting the derivative of the spin-averaged absorption spectra from the experimental XMCD data. The deconvolution has to be carried out before applying sum rules to determine 4f and 5d moments.