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It is shown that the ordering of oxygen found in the basal plane of YBa 2 Cu 3 O 6.5 can be explained in terms of the long-range Coulomb interaction between the oxygen ions, the ionization potential of copper and the electron affinity of oxygen. Furthermore, it is shown that the ordering induces self-doping and creates holes in the CuO 2 planes even though the nominal hole content of this substance is zero.
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Jun Kondo (1990) studied this question.
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