Abstract

The state with anomalous high conductivity is observed at temperature T c in the room temperature range for some low-coordinated semiconductors (chalcogenide glasses) and polymers. We propose a model to describe the phenomenon based on the theory of superconducting (SC) properties of the system of localized electron pairs. SC properties of the model are determined by transport along a band formed by the localized pairs of carriers belonging to negative- U centers, i.e., intrinsic defects with a negative effective correlation energy ( U<0). The negative- U centers superconducting model (NUCS model) also well describes the high- T c superconducting state in metal oxides.

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