Electron transfer of local pairs in crystals and the superconductivity of metal-oxide compounds

The hybridization of two-electron centers (local pairs) with conduction electrons in crystals results in a universal interaction between pairs. This mechanism effects the transfer of pairs between their localization sites even when the wave functions do not overlap directly. The transition to the ordered state is of the “superconducting glass” type. If the energy level of the pairs (per electron) lies above the Fermi level or is in the energy gap near the boundary of the occupied states, then the mechanism of “recurrent” superconductivity is possible.

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