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- W2021199109 abstract "At ${T}_{V}ensuremath{sim}40phantom{rule{0.3em}{0ex}}mathrm{K}$, the intermetallic compound $mathrm{Yb}mathrm{In}{mathrm{Cu}}_{4}$ experiences an isostructural phase transition associated with a change in the valence state of Yb ions and with the alteration in the energy scale for Kondo interaction. Our study of the specific heat $C$ in the temperature range of $0.4--300phantom{rule{0.3em}{0ex}}mathrm{K}$ at partial substitution of Yb for La and Ce reveals qualitatively different trends in the evolution of this phase transition for the both doping series. In ${mathrm{Yb}}_{1ensuremath{-}x}{mathrm{La}}_{x}mathrm{In}{mathrm{Cu}}_{4}$, with $0ensuremath{le}xensuremath{le}0.25$, the anomalies in the specific heat exhibit features pertinent for the first order phase transition. In ${mathrm{Yb}}_{1ensuremath{-}x}{mathrm{Ce}}_{x}mathrm{In}{mathrm{Cu}}_{4}$, with $0ensuremath{le}xensuremath{le}0.2$, doping with Ce causes an evolution from the first order phase transition in the parent compound to a behavior characteristic for concentrated Kondo systems with a unique energy scale. The entropy change at the phase transition $ensuremath{Delta}S$ diminishes systematically reaching $5.6phantom{rule{0.3em}{0ex}}mathrm{J}∕{mathrm{mol}}_{mathrm{Yb}}phantom{rule{0.2em}{0ex}}mathrm{K}$ in ${mathrm{Yb}}_{0.8}{mathrm{Ce}}_{0.2}mathrm{In}{mathrm{Cu}}_{4}$ as compared to $12.6phantom{rule{0.3em}{0ex}}mathrm{J}∕{mathrm{mol}}_{mathrm{Yb}}phantom{rule{0.2em}{0ex}}mathrm{K}$ in $mathrm{Yb}mathrm{In}{mathrm{Cu}}_{4}$. This suggests that the Ce doping influences the valence of the Yb ions." @default.
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- W2021199109 date "2007-11-21" @default.
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- W2021199109 title "Interplay between the valence phase transition and Kondo behavior in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>Yb</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant=normal>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant=normal>In</mml:mi><mml:msub><mml:mi mathvariant=normal>Cu</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></…" @default.
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