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- W1968900624 abstract "Extended x-ray absorption fine structure (EXAFS) measurements have been carried out at the $L$ $K$- or ${L}_{III}$-edges ($L=mathrm{Ce}$, Eu, and Yb) and $T$ $K$-edges ($T=mathrm{Fe}$ and Ru) for a series of filled skutterudite materials, $L{T}_{4}{X}_{12}$ ($X=mathrm{P}$ and Sb). The high correlated Debye temperature $({ensuremath{Theta}}_{D}ensuremath{sim}400phantom{rule{0.3em}{0ex}}mathrm{K})$ obtained for the $Ttext{ensuremath{-}}X$ peak indicates that the ${T}_{4}{X}_{12}$ framework is relatively stiff. In contrast, the low Einstein temperature $({ensuremath{Theta}}_{E}ensuremath{sim}100phantom{rule{0.3em}{0ex}}mathrm{K})$ obtained for the $Ltext{ensuremath{-}}X$ or $Ttext{ensuremath{-}}L$ pairs strongly supports the concept of a ``rattling'' local mode behavior for the $L$ ions. The analysis also indicates that this rattling frequency is much smaller in the antimonide skutterudites than in the phosphide ones, and smaller in $mathrm{Ce}{mathrm{Os}}_{4}{mathrm{Sb}}_{12}$ than in $mathrm{Ce}{mathrm{Fe}}_{4}{mathrm{Sb}}_{12}$. Both results indicate that the larger the void within which the Ce atom is located, the lower the rattling frequency. In addition, for some systems in which the signal-to-noise for ${ensuremath{sigma}}^{2}(T)$ is high, a fit can be made to extract the reduced mass of the rattling atom; in these cases the obtained reduced mass is close to but slightly below that of the rattler atom mass-clear evidence of a localized mode inside a stiff but not rigid cage. Finally, no clear evidence for any off-center displacement of the filler ions was found in these materials." @default.
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- W1968900624 date "2004-09-20" @default.
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- W1968900624 title "Evidence for rattling behavior of the filler atom<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mo>(</mml:mo><mml:mi>L</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>in the filled skutterudites<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>L</mml:mi><mml:msub><mml:mi>T</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>X</mml:mi><mml:mn>12</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=…" @default.
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- W1968900624 doi "https://doi.org/10.1103/physrevb.70.094109" @default.
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