Coulomb splitting of atomic layers in crystal lattices of layered cuprates and nickelates

The crystal structure data are collected and analyzed on the splitting of anion-cation layers with non-symmetric electric charge environment. It is shown that the effect is caused by Coulomb interaction with the other charged layers, mainly the nearest neighboring ones. The feasibility is demonstrated of the control of interlayer charge transfer by magnitude of the Coulomb splitting. The correlation between the Coulomb splitting of (BaO) layers, neighboring to (CuO2), and superconducting transition temperature T-c is found in yttrium-barium cuprates.