Abstract
Samples with the nominal composition Bi 2Sr 2Ca 1Cu 2− x Ni x O 8+δ ( x = 0.00, 0.02, 0.10, 0.20) have been studied by X-ray photoelectron spectroscopy (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 ( T c ) 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 ( n h ) of the CuO 2 planes.
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