Combining photoemission and optical spectroscopies for reliable valence determination in YbS and Yb metal
Combining photoemission and optical spectroscopies for reliable valence determination in YbS and Yb metal
复制标题
DOI：
10.1103/physrevb.78.195118
复制
发表时间：
2008-09
影响因子：
3.7
通讯作者：
M. Matsunami;A. Chainani;M. Taguchi;R. Eguchi;Y. Ishida;Y. Takata;H. Okamura;T. Nanba;M. Yabashi;K. Tamasaku;Y. Nishino;T. Ishikawa;Y. Senba;H. Ohashi;A. Ochiai;S. Shin
中科院分区：
文献类型：
--
作者：
M. Matsunami;A. Chainani;M. Taguchi;R. Eguchi;Y. Ishida;Y. Takata;H. Okamura;T. Nanba;M. Yabashi;K. Tamasaku;Y. Nishino;T. Ishikawa;Y. Senba;H. Ohashi;A. Ochiai;S. Shin
对YbS和Yb金属进行了硬X射线光电子能谱和光谱分析，以确定精确的电子占有率。光电子能谱与由光学反射率获得的体表能量损失函数的比较，使我们能够区分能量损失卫星的{{Text{Yb}}^{2+}$峰和${\Text{Yb}}^{3+}$多重态。结果清楚地表明，除了YBS的表面被氧化改变外，Yb是纯的二价态。我们证明了本方法对于确定电子体系的电子结构和平均价态是非常可靠的。
Hard x-ray photoemission and optical spectroscopies have been performed on YbS and Yb metal to determine the precise $f$-electron occupation. A comparison of the photoemission spectra with the energy-loss functions in bulk and surface, obtained from optical reflectivity, enables us to distinguish between the energy-loss satellite of ${\text{Yb}}^{2+}$ peak and the ${\text{Yb}}^{3+}$ multiplet. The results clearly indicate a purely divalent Yb state except for the surface of YbS which is altered by oxidation. We demonstrate that the present method is highly reliable in identifying the electronic structure and the mean valence in $f$-electron systems.