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Here we suggest a simple physical model of HTSC cuprates that providesqualitative explanation of the main features of these compounds, including thenature of Fermi arcs, pseudogap anomalies and the origin of free carriers.According to this model, the unusual properties of HTSC cuprates result fromtheir unique electronic structure favourable for the formation of diatomicnegative-U centers (NUCs) and realization of an unusual mechanism ofelectron-electron interaction.

Fermi arcs and the nature of carriers in cuprate HTSC