A metallic domain model for CuCl

A simplified model of small metallic regions embedded in an insulator is presented, to explain the anomalous results found in CuCl. The Dyson equations for the model are set up and a self-consistent procedure, which can be used to obtain detailed solutions, is outlined. Without solving the equations, it is found that the anomalous Green's function for the metallic region is a rapidly decaying function of the distance from the metal-insulator boundary. This indicates the existence of surface superconductivity, which could account for almost ideal diamagnetism as well as non zero resistivity. (author)