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• W190733376 abstract "A polarization-dependent I ${mathit{L}}_{1mathrm{ensuremath{-}}}$, Cu K-, and Bi ${mathit{L}}_{3}$-edge x-ray-absorption near-edge structure study has been carried out on both ${mathrm{IBi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{mathit{y}}$ and ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{mathit{y}}$ single crystals. The I ${mathit{L}}_{1}$-edge results indicate that the intercalated iodine layers receive electronic charges and the I 5p-orbital holes are in states primarily oriented in the I plane. The Cu K-edge results show that the electronic structure of the ${mathrm{CuO}}_{2}$ layer is only slightly affected by the iodine intercalation. Some evidence for a small shift of the unoccupied Cu bands towards higher energy and a weakening of the ligand to Cu charge transfer is seen. These effects could nevertheless be contributing factors to the decrease of ${mathit{T}}_{mathit{c}}$. It is observed that iodine intercalation induces about 0.25 eV downward (and upward) edge shift in the Bi ${mathit{L}}_{3}$-edge spectrum with the polarization vector E?c axis (and Eensuremath{perp}c axis). We interpret this observation by the downward shift of the out-of-plane part and upward shift of the in-plane part of the 6${mathit{d}}_{mathit{t}2mathit{g}}$ and 6${mathit{d}}_{mathit{e}mathit{g}}$ states, caused by the change of the Bi-O bonding configuration from octahedral to pyramidal. Our results indicate that the Bi valence state is close to +3 in both ${mathrm{IBi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{mathit{y}}$ and ${mathrm{Bi}}_{2}$${mathrm{Sr}}_{2}$${mathrm{CaCu}}_{2}$${mathrm{O}}_{mathit{y}}$ crystals but with the Bi sites manifesting a more metalliclike behavior along the c-axis direction upon iodine intercalation." @default.
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• W190733376 date "1993-01-01" @default.
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• W190733376 title "X-ray-absorption near-edge structure study of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>IBi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></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 mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math…" @default.
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• W190733376 doi "https://doi.org/10.1103/physrevb.47.1029" @default.
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