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Here we report about the interface reconstruction in the recently discoveredsuperconducting artificial superlattices based on insulating CaCuO2 and SrTiO3blocks. Hard x-ray photoelectron spectroscopy shows that the valence bandsalignment prevents any electronic reconstruction by direct charge transferbetween the two blocks. We demonstrate that the electrostatic built-inpotential is suppressed by oxygen redistribution in the alkaline earthinterface planes. By using highly oxidizing growth conditions, the oxygencoordination in the reconstructed interfaces may be increased, resulting in thehole doping of the cuprate block and thus in the appearance ofsuperconductivity.

Interface reconstruction in superconducting CaCuO2/SrTiO3 superlattices: A hard x-ray photoelectron spectroscopy study