Abstract
Resistive properties of composites Ag5Pb2O6/M (M=CuO, Cu2O) have been studied in the vicinity of the percolation threshold (concentration w/w∼0.48). Metallic particles of the Bystrom-Evers oxide Ag5Pb2O6 are covered by an overlayer of Cu2O (∼8 nm). Measurements suggest the exciton type superconductivity originally proposed by Little 1D model and extended to the 2D configuration by Ginzburg. An application of the Ginzburg model to the Ag5Pb2O6 particles dressed in the Cu2O overlayer involves monovalent Ag2 dimers moving in the hexagonal channels of the Ag5Pb2O6 lattice. Dimers are considered be unsaturated on the grain surface. It is applied to the Swiss cheese model of the percolation, and dielectric holes between metallic particles are assumed to act as resonant microcavities driving the strong coupling of the photon field to excitons in the Cu2O overlayer. Accordingly, polariton states may be created and possible polariton mechanism of the superconductivity is discussed in terms of the model put forward by Laussy and coworkers.
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