RESONANT-TUNNELING AND PERPENDICULAR CONDUCTION IN CUPRATE CONDUCTORSWITH VARYING O-CONTENT

Anisotropy is inherent to layered cuprates with conduction mainly conf ined to the CuO2-planes, claimed to be the source of superconductivity . Resonant tunnel exchange for conduction parallel and perpendicular t o the CuO2-planes shows different normal and superconducting propertie s by charging energies and localizations at the in-plane perturbations being atomic-like and between the CuO2-planes, being extended. By ove rdoping the wave function overlap in perpendicular direction via the e xtended states grows, especially in the superconducting state. The cou nteraction of overlap and charging energies yield activated resonant t unneling, i.e. the pseudo gap, in the normal state and Josephson tunne ling in the superconducting state.