Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy
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arXiv
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| Format: | Preprint |
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2022
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| author | Frontini, Felix Lebert, Blair W. Cho, K. K. Song, M. S. Cho, B. K. Pollock, Christopher J. Kim, Young-June |
| author_facet | Frontini, Felix Lebert, Blair W. Cho, K. K. Song, M. S. Cho, B. K. Pollock, Christopher J. Kim, Young-June |
| contents | 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 $T_v$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2204_13748 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy Frontini, Felix Lebert, Blair W. Cho, K. K. Song, M. S. Cho, B. K. Pollock, Christopher J. Kim, Young-June Strongly Correlated Electrons 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 $T_v$. |
| title | Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2204.13748 |