論文

査読有り
2022年4月

Pressure-induced changes of valence fluctuation in beta-YbAlB4 probed by x-ray absorption spectroscopy

PHYSICAL REVIEW B
  • Yui Sakaguchi
  • ,
  • Shugo Ikeda
  • ,
  • Naomi Kawamura
  • ,
  • Masaichiro Mizumaki
  • ,
  • Kentaro Kuga
  • ,
  • Shintaro Suzuki
  • ,
  • Keita Sone
  • ,
  • Satoru Nakatsuji
  • ,
  • Hisao Kobayashi

105
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
DOI
https://doi.org/10.1103/PhysRevB.105.155129
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000804077800006&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevB.105.155129
  • ISSN : 2469-9950
  • eISSN : 2469-9969
  • Web of Science ID : WOS:000804077800006

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