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VOLUME 74 (2001) | ISSUE 7 | PAGE 435
Theory of high-Tc superconductivity based on the fermion-condensation quantum phase transition
PACS: 71.27.+a, 74.20.Fg, 74.25.Jb
Abstract
A theory of high temperature superconductivity based on the combination of the fermion-condensation quantum phase transition and the conventional theory of superconductivity is presented. This theory describes maximum values of the superconducting gap which can be as big as \Delta_1\sim 0.1\varepsilon_F, with \varepsilon_F being the Fermi level. We show that the critical temperature 2T_c\simeq\Delta_1. If there exists the pseudogap above Tc then 2T^*\simeq\Delta_1, and T* is the temperature at which the pseudogap vanishes. A discontinuity in the specific heat at Tc is calculated. The transition from conventional superconductors to high-Tc ones as a function of the doping level is investigated. The single-particle excitations and their lineshape are also considered.