Copper 2P core level X-ray photoelectron spectra on several high Tc superconductors La1.85Ba0.15CuO4, Y1.2Ba0.8CuO4-δ and Y0.4B0.6CuO4-δ oxides have been measured. The results indicate the coexistence of Cu2+ and Cu3+ in these compounds.
|Number of pages||3|
|Journal||Solid State Communications|
|State||Published - Nov 1987|