Abstract:
A simple physical picture of superconductivity is proposed for extremely doped CuO$_2$ planes. It possesses features that are observed for HTSC, such as a high superconducting transition temperature, the $d_{x^2-y^2}$ symmetry of order parameter, and the coexistence of a one-electron Fermi surface and the Bose-Einstein condensate of preformed electron pairs.
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