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Intermediate valence state in YbB 4 revealed by resonant x-ray emission spectroscopy

https://doi.org/10.1088/1361-648X/ac7629

Frontini, Felix ; Lebert, Blair W. ; Cho, K. K. ; Song, M. S. ; Cho, B. K. ; Pollock, Christopher J. ; Kim, Young-June ( June 2022 , Journal of Physics: Condensed Matter)

Abstract
We report the temperature dependence of the Yb valence in the geometrically frustrated compound ${Y b B}_{4}$ 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 thev = 2 andv = 3 valence states, increasing from $v = 2.61 \pm 0.01$ at 12 K to $v = 2.67 \pm 0.01$ at 300 K, confirming that ${Y b B}_{4}$ is a Kondo system in the intermediate valence regime. This result indicates that the Kondo interaction in ${Y b B}_{4}$ is substantial, and is likely to be the reason why ${Y b B}_{4}$ 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 scaleT_v.

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