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• W2010167306 abstract "An accurate multiple-scattering Cu $K$-edge extended x-ray-absorption fine-structure (EXAFS) study of the average local structure of ${mathrm{Nd}}_{1.85}{mathrm{Ce}}_{0.15}{mathrm{CuO}}_{4}$ and ${mathrm{Nd}}_{2}{mathrm{CuO}}_{4}$ is presented in the range of temperature 5--150 K. Clear differences between experimental EXAFS signals of doped and undoped compounds recorded at the same temperature are found. Shortening of 0.015 AA{} of the average Cu-Nd/Ce distance is unambiguously detected in the doped-superconducting compound. We show that the contraction of the unit cell along the $c$ direction can be assigned to the shift of the Nd/Ce atoms toward the adjacent ${mathrm{CuO}}_{2}$ plane. No evidence for anomalies of the in-plane Cu-Cu and Cu-O distance distribution is found as a function of temperature and doping. The strong multiple-scattering signal associated with the quasilinear Cu-O-Cu chains in the ${mathrm{CuO}}_{2}$ planes is used to evaluate the angle distribution at the oxygen site, using a suitable model describing a realistic three-atom vibrating system. Differences between the doped and the undoped compound are detected showing that the angle distribution is broader below ${T}_{c}$ in the doped compound. The increased width of the angle distribution is consistent with the existence of local modes or permanent structural distortions involving the in-plane oxygens." @default.
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• W2010167306 date "1998-03-01" @default.
• W2010167306 modified "2023-10-01" @default.
• W2010167306 title "Short-range structural properties of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Nd</mml:mi></mml:mrow><mml:mrow><mml:mn>1.85</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ce</mml:mi></mml:mrow><mml:mrow><mml:mn>0.15</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>CuO</mml:mi></mml:mrow><mml:mrow><mml:mn…" @default.
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• W2010167306 doi "https://doi.org/10.1103/physrevb.57.6067" @default.
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