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- W2051263276 abstract "This paper makes a contribution towards understanding recent extended x-ray-absorption fine-structure (EXAFS) measurements on the mixed-valence solid ${mathrm{Sm}}_{x}{mathrm{Y}}_{1ensuremath{-}x}mathrm{S}$. These experiments have been interpreted as showing that the difference $ensuremath{delta}R$ between the nearest-neighbor distances ${mathrm{Sm}}^{2+}$-${mathrm{S}}^{2ensuremath{-}}$ and ${mathrm{Sm}}^{3+}$-${mathrm{S}}^{2ensuremath{-}}$ is less than 0.05 AA{}. The difference between the ionic radii of ${mathrm{Sm}}^{2+}$ and ${mathrm{Sm}}^{3+}$ is much larger, 0.18 AA{}. We show that in the fluctuating-valence solid the large electronic hybridization energy (enhanced by the sixfold degeneracy of the ${mathrm{Sm}}^{3+}$ configuration), tends to strongly reduce the dependences of the positions of ${mathrm{S}}^{2ensuremath{-}}$ ions on the valency of the Sm ions. We find that $ensuremath{delta}R$ lies in the range between 0.045 and 0.06 AA{}, and could possibly be even smaller if a better estimate of the crucial hybridization matrix element $frac{ensuremath{Delta}}{ensuremath{pi}}$ should become available." @default.
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- W2051263276 date "1982-03-15" @default.
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- W2051263276 title "Theory of extended x-ray-absorption fine structure in a mixed-valence solid" @default.
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- W2051263276 doi "https://doi.org/10.1103/physrevb.25.3557" @default.
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