Theory of Electric Quadrupole Transition in the XMCD Spectra at the Yb L3 Edge of Mixed Valence Yb Compounds in High Magnetic Fields
Theory of Electric Quadrupole Transition in the XMCD Spectra at the Yb L3 Edge of Mixed Valence Yb Compounds in High Magnetic Fields
复制标题
高磁场下混合价镱化合物Yb L3边缘XMCD谱中电四极跃迁理论
DOI：
10.1088/1742-6596/430/1/012002
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
小谷章雄
中科院分区：
文献类型：
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作者：
M. Mizumaki;T. Saito;T. Uozumi;and Y. Shimakawa;小谷章雄
研究了混合价化合物YbInCu 4和YbAgCu 4在强磁场中的场致价跃迁附近的X射线磁圆二色性电四极跃迁谱。使用一个新的配方与一个单一的杂质安德森模型，它直接连接的EQ-XMCD光谱的Yb 4f的角动量j z在基态的权重，我们表明，EQ-XMCD强度的YbAgCu 4是YbInCu 4的两倍以上。这解释了为什么最近成功地测量了YbAgCu 4的EQ-XMCD谱，而迄今为止还没有获得YbInCu 4的EQ-XMCD的实验证据。不同的EQ-XMCD强度的两种材料和一个特殊的EQ-XMCD强度的依赖性的字段的基础上的权重的j z在基态进行了讨论。
The spectra of X-ray magnetic circular dichroism by the electric quadrupole transition (EQ-XMCD) are theoretically studied at the Yb L 3 edge of mixed valence compounds, YbInCu 4 and YbAgCu 4, around the field-induced valence transition in high magnetic fields. Using a new formulation with a single impurity Anderson model, which directly connects the EQ-XMCD spectra with the weights of the Yb 4f angular momentum j z in the ground state, we show that the EQ-XMCD intensity of YbAgCu 4 is more than twice as large as that of YbInCu 4. This explains the reason for that the EQ-XMCD spectra was very recently measured successfully for YbAgCu 4, whereas no experimental evidence of EQ-XMCD has so far been obtained for YbInCu 4. Different EQ-XMCD intensities for the two materials and a peculiar field dependence of EQ-XMCD intensities are discussed on the basis of the weights of j z in the ground state.