论文标题
$ \ mathrm {ybb_4} $中的中级价状态由resonant X射线发射光谱显示
Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy
论文作者
论文摘要
我们通过yb $ l_ {α_1} $ transition在几何沮丧的化合物$ \ mathrm {ybb_4} $中报告了YB价的温度依赖性。我们发现，YB Valence（$ V $）在$ v = 2 $和$ v = 3 $ Valence状态之间杂交，从$ v = 2.61 \ pm0.01 $ at 12 k到$ v = 2.67 \ pm0.01 $ v = 2.67 \ pm0.01 $ 300 k，确认$ \ mathrm {ybb_4} $ a System a a ky nes n is a kondo ins in kny nes kondo。该结果表明，$ \ mathrm {ybb_4} $中的近相互作用很重要，并且很可能是$ \ mathrm {ybb_4} $的原因，而不是在低温下磁性订购，而不是这是几何挫败感的效果。此外，从我们的数据中提取了系统的零点价，并将其与其他Kondo晶格系统进行了比较。零点价似乎微弱地取决于昆多温度量表，但不取决于变化温度尺度$ t_v $。
We report the temperature dependence of the Yb valence in the geometrically frustrated compound $\mathrm{YbB_4}$ from 12 to 300 K using resonant X-ray emission spectroscopy at the Yb $L_{α_1}$ transition. We find that the Yb valence, $v$, is hybridized between the $v=2$ and $v=3$ valence states, increasing from $v=2.61\pm0.01$ at 12 K to $v=2.67\pm0.01$ at 300 K, confirming that $\mathrm{YbB_4}$ is a Kondo system in the intermediate valence regime. This result indicates that the Kondo interaction in $\mathrm{YbB_4}$ is substantial, and is likely to be the reason why $\mathrm{YbB_4}$ does not order magnetically at low temperature, rather than this being an effect of geometric frustration. Furthermore, the zero-point valence of the system is extracted from our data and compared with other Kondo lattice systems. The zero-point valence seems to be weakly dependent on the Kondo temperature scale, but not on the valence change temperature scale $T_v$.
