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X-ray photoelectron spectroscopies of Ni-doped Bi-2212 compounds

Samples with the nominal composition Bi2Sr2Ca1Cu2-xNixO 8+δ (x = 0.00, 0.02, 0.10, 0.20) have been studied by X-ray photoelectron spectroseopy (XPS). From deconvolution of Bi 4f and O 1s XPS core-level spectra, we propose that the main reason leading to the decrease of superconducting transition temperature (Tc) with increasing Ni content, is the distortion of the Bi-2212 crystal structure by extra oxygen being intercalated between the adjacent Bi-O layers which then affects the hole concentration (nh) of the CuO2 planes. © 1998 Elsevier Science B.V. All rights reserved.

 Man N.K., Garg K.B., Hien T.D., Sinh N.H., Phuc N.X., Venkatesh S.
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  Từ khóa : Crystal structure; Electric conductivity; Electron energy levels; High temperature superconductors; Magnetic permeability; Nitrogen; Oxide superconductors; Superconducting transition temperature; X ray photoelectron spectroscopy; X ray powder diffraction; Hole concentration; Valence state; Bismuth compounds