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- W2083803800 abstract "Detailed analyses of Cu K-edge x-ray-absorption near-edge structure (XANES) of electron-doped and hole-doped Cu-based oxides with several Ce/Sr substitution rates, ${mathrm{Nd}}_{2mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Ce}}_{mathrm{x}}$${mathrm{CuO}}_{4mathrm{ensuremath{-}}mathrm{y}}$ and ${mathrm{La}}_{2mathrm{ensuremath{-}}mathrm{x}}$${mathrm{Sr}}_{mathrm{x}}$${mathrm{CuO}}_{4}$ have revealed that each Ce/Sr substitution has an effect on ensuremath{sim}4--5 Cu sites and that an additional electron or hole supplied with the substitution is distributed mainly to ensuremath{sim}4--5 [${mathrm{CuO}}_{2}$] units, yielding ``impurity (localized) states.'' When x=0.15 the ``impurity states'' amount to ensuremath{sim}60--75 % of the whole [${mathrm{CuO}}_{2}$] units; the interaction and superposition among the localized states are caused to produce bands like Fermi-liquid states. The substitution causes substantial and a little change in the XANES spectra of Nd-Ce-Cu-O and La-Sr-Cu-O, respectively. This means that the electron doping takes place mainly at the Cu site of [${mathrm{CuO}}_{2}$] in Nd-Ce-Cu-O and that the hole doping in La-Sr-Cu-O takes place mainly at the oxygen site. In the ``unreduced'' Nd-Ce-Cu-O samples no monovalent species but rather divalent species with relatively large 3${d}^{10}$ contributions are found. In the ``reduced'' and superconducting Nd-Ce-Cu-O sample (x=0.15), ${mathrm{Cu}}_{2}$O-like monovalent species are found but probably correspond to segregated impurity phases. The essential effect of the reduction to induce the superconductivity in Nd-Ce-Cu-O (xensuremath{sim}0.15) has not yet been revealed." @default.
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- W2083803800 title "Cu<i>K</i>-edge x-ray-absorption near-edge structure and electronic structure 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>2</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=normal>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi …" @default.
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- W2083803800 doi "https://doi.org/10.1103/physrevb.41.131" @default.
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