Abstract
Anisotropy is inherent to layered cuprates with conduction mainly confined to the CuO2-planes, claimed to be the source of superconductivity. Resonant tunnel exchange for conduction parallel and perpendicular to the CuO2-planes shows different normal and superconducting properties by charging energies and localizations at the in-plane perturbations being atomic-like and between the CuO2-planes, being extended. By overdoping the wave function overlap in perpendicular direction via the extended states grows, especially in the superconducting state. The counteraction of overlap and charging energies yield activated resonant tunneling, i.e. the pseudo gap, in the normal state and Josephson tunneling in the superconducting state.
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