Abstract
The distribution of positive holes in high-Tc cuprate superconductors is discussed in terms of the electrostatic potential in crystals. The maps of the crystal potential are drawn for Tl2Ba2Can-1CunO2n+4 (n=1–4) homologous series of high-Tc superconductors. Close to the CuO2 layer, there are always negative regions, which extend over the entire crystal. Moreover, the potential distribution at a plane of an apical oxygen becomes positive almost everywhere. It is thus realized that a supercurrent carried by holes will be confined within the conduction layer between the planes of apical-oxygen. Furthermore, the potential of the TlO layer, which is considered as a charge reservoir, is far positive. According to the potential gradient, electrons will move out from the CuO2 (conduction) layer to the TlO layer, while holes will move in the opposite direction.
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