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- W2002102551 abstract "Changes in the electronic structure for the (Pb0.5Cd0.5)(Sr2−xBax)(Ca0.5Y0.5)Cu2O7 (0 ≤ x ≤ 0.5) system associated with an semiconductor-superconductor transition have been investigated by means of X-ray photoelectron spectroscopy. The main line of Cu 2p32 core level and the valence-band peak in the range of 0∼8 eV for the samples are broadened with Ba doping, which suggest that there are two charge-transfer mechanisms; in-plane O 2px, y → Cu 3dx2−y2 and apical O 2pz → Cu 3d3z2−r2, in the system. For the higher doped (x=0.4 and 0.5) superconductive samples, the latter charge transfer seems to be more pronounced than that for the semiconductor samples (x ≤ 0.3). Pb4f and O ls core-level spectra show that as the Ba doping content increases the oxidation state of Pb increases. The state of density in the Fermi level increases slightly, and a new state appears more clearly just below the Fermi level with the partial substitution of Ba for Sr, which can be attributed to the presence of apical O 2pz derived holes in the (Sr,Ba)O layers. The evidence suggests that the appearance of superconductivity in the (Pb,Cd)-1212 system has a relation with the changes in electronic structure, especially the apical O 2pz → Cu 3d3z2−r2 hybridization mechanism." @default.
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- W2002102551 date "1996-04-01" @default.
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- W2002102551 title "Electronic structure of the Ba-doped (Pb,Cd)-1212 cuprates" @default.
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