Determination of pressure-induced valence changes in YbAl2 by resonant inelastic x-ray emission
Determination of pressure-induced valence changes in YbAl2 by resonant inelastic x-ray emission
复制标题
通过共振非弹性 X 射线发射测定 YbAl2 中压力引起的价态变化
DOI：
10.1103/physrevb.68.245114
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发表时间：
2003
影响因子：
3.7
通讯作者：
M. Grioni
中科院分区：
文献类型：
--
作者：
C. Dallera;E. Annese;J. Rueff;A. Palenzona;G. Vankó;L. Braicovich;A. Shukla;M. Grioni
在部分荧光产额模式(PFY)下进行的高分辨率X射线吸收(XAS)和共振发射(RXES)等新型X射线能谱为探测强关联系统中的体电子组态提供了新的机会。我们对YbAl_2的中间价化合物YbAl_2在外压下进行了Yb-L-3PFY-XAS和RXES研究。我们发现Yb价从常压下的2.25增加到385kbar时的2.9。这个实验扩大了到目前为止探索的压强范围，以覆盖整个价态转变，我们发现这个转变在200kbar左右完成。此外，新数据大大减少了先前估计的实验误差范围，并提供了迄今为止对这一转变的最准确描述。我们讨论了从光谱数据中提取4f占位的各种方法的相对优点。
Novel x-ray spectroscopies such as high-resolution x-ray absorption (XAS) performed in the partial fluorescence yield mode (PFY), and resonant emission (RXES) offer new opportunities to probe the bulk electronic configuration in strongly correlated systems. We performed an Yb L-3 PFY-XAS and RXES investigation of the intermediate valence compound YbAl2 under external pressure. We found that the Yb valence increases from 2.25 at ambient pressure to 2.9 at 385 kbar. This experiment has extended the range of pressures explored until now, in order to cover the whole valence transition, which we find to be completed around 200 kbar. Moreover, the new data considerably reduce the experimental error bars on previous estimates and provide the most accurate description to date of this transition. We discuss the relative merits of various approaches to extract the 4f occupancy from the spectroscopic data.
共振和近共振非弹性 X 射线散射光谱
DOI：
--
发表时间：
2004
期刊：
J.Electron Spectry.Relat.Phenom. 137-140
影响因子：
--
作者：
Gucsik;A;others;H.Hayashi et al.
通讯作者：
H.Hayashi et al.