2022年4月
Pressure-induced changes of valence fluctuation in beta-YbAlB4 probed by x-ray absorption spectroscopy
PHYSICAL REVIEW B
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- 巻
- 105
- 号
- 15
- 開始ページ
- 155129-1
- 終了ページ
- 155129-8
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevB.105.155129
- 出版者・発行元
- AMER PHYSICAL SOC
We report detailed valence fluctuation phenomena in the unique quantum-critical compound 0-YbAlB4 under pressures and at low temperatures. We directly observed the drastic change in the pressure dependence of the mean Yb valence at about 3 GPa with no pressure-induced structural transition. Below 3 GPa, the anomaly in the temperature dependences of the mean Yb valence was observed at about 55 K under ambient pressure, corresponding to a previously observed reduced Kondo coherence temperature, and this temperature rapidly decreases to 22 K at 2.2 GPa, in contrast to the monotonous decrease of the high Kondo temperature (similar to 250 K at ambient pressure). The present results reveal that this reduced Kondo coherence temperature is responsible for the unconventional quantum critical behaviors in beta-YbAlB4. Above 3 GPa, it was found that the temperature dependence of the mean Yb valence exhibits a discontinuous change at low temperature (10.5 and 9 K under 4.8 and 5.5 GPa, respectively).
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevB.105.155129
- ISSN : 2469-9950
- eISSN : 2469-9969
- Web of Science ID : WOS:000804077800006