Abstract
The generation of hole carriers in HTS is considered in the framework of model [JETP 91 (2000) 579]. According to this model the hole conductivity starts up at the dopant concentration exceeding the percolation threshold for chain of negative-U centers (NUC). The conductivity (and superconductivity) takes place in the band formed by the oxygen pπ-orbitals hybridized with the pair orbitals of NUC. It is shown that this two-particle hybridization results in the temperature dependences of hole carrier concentration n(T)∝T and resistivity R(T)∝T. As far as the mechanism of superconducting gap suppression in HTS is the occupation of pair level with electrons, the superconducting gap (pseudogap) in small nonpercolative clusters containing short chains of NUC has to be opened at T above Tc because of the large relative fluctuations of the number of particles between pπ-band and pair level in small clusters.
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