SIMPLE THEORY OF EXTREMELY OVERDOPED HTS
Andreev A.F.

Received: November 15, 2004

PACS: 74.20.-z, 74.78.-w

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We demonstrate the existence of a simple physical picture of superconductivity for extremely overdoped CuO₂ planes. It has all the characteristic features of HTS, such as a high superconducting transition temperature, the d_{x² - y²} symmetry of the order parameter, and the coexistence of a single-electron Fermi surface and a pseudogap in the normal state. The values of the pseudogap are calculated for different doping levels. Orbital paramagnetism of preformed pairs is predicted.