X-ray Photoelectron Spectroscopy on Superconducting T12CaBa2Cu2O8 Thin Film
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Abstract
We have prepared single-phase superconducting T12CaBa2Cu2O8 thin film by dc magnetron sputtering process and measured X-ray photoelectron spectra of the film at room and liquid nitrogen temperatures. From the relative intensities of the Ba3d, Tl4f. O1 s and Cu2p spectra taken at different take-off angles, we have concluded that there is an adventitious contamination (nonsupercon-ducting phase) surface layer. After excluding contributions from these spurious phases, we have tentatively assigned which core-level shifts should be caused by the superconducting phase transition.
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