We present XPS studies of semiconducting Nd2-xCexCuO4 (0≤x≤0.20) and superconducting Nd1.85Ce0.15CuO4-y to clarify the location of the electron carriers. Examination of the Ce3d spectra shows that the Ce ions are donors of electron carriers. From the analysis of the Cu2p spectra, the Cu+ concentration is found to increase with the Ce concentration x. A definite increase in the Cu+ concentration due to the reduction procedure is found for the superconducting sample. The present results suggest that the conduction of the electron carriers takes place in the CuO4 square plane in this system.
|Number of pages||3|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Publication status||Published - 1989 May|
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)