WHY DOES HIGH Tc SOMETIMES DEPEND ON OXIDATION — AN INVESTIGATION OF MADELUNG POTENTIALS

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Abstract
Some high temperature superconductors require atmospheres of oxygen for the formation of the superconducting phase, and others do not. The former corrode more easily and includes the doped compound ( La 1.5 Ba 0.5) CuO 4. In the latter class, Cu ions inhabit sites with large ionic potential, which apparently allows the formation of high charge states such as Cu (d8) or CuO +. An elementary code was used to examine potentials on a number of defect sites. Thus a high charge state on polyvalent Cu is a feature common to both types of superconductors.

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