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- W4224059042 abstract "We report detailed valence fluctuation phenomena in the unique quantum-critical compound $ensuremath{beta}text{ensuremath{-}}{mathrm{YbAlB}}_{4}$ 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 ($ensuremath{sim}250phantom{rule{0.16em}{0ex}}mathrm{K}$ at ambient pressure). The present results reveal that this reduced Kondo coherence temperature is responsible for the unconventional quantum critical behaviors in $ensuremath{beta}text{ensuremath{-}}{mathrm{YbAlB}}_{4}$. 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)." @default.
- W4224059042 created "2022-04-19" @default.
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- W4224059042 date "2022-04-15" @default.
- W4224059042 modified "2023-10-18" @default.
- W4224059042 title "Pressure-induced changes of valence fluctuation in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>β</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>YbAlB</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math> probed by x-ray absorption spectroscopy" @default.
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- W4224059042 doi "https://doi.org/10.1103/physrevb.105.155129" @default.
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