Theory of high-T
c
superconductivity based on the fermion-condensation quantum phase transition |
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| Authors: | M Ya Amusia S A Artamonov V R Shaginyan |
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| Institution: | (1) The Racah Institute of Physics, the Hebrew University, Jerusalem, 91904, Israel;(2) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(3) Institute of Nuclear Physics, Russian Academy of Sciences, Gatchina, Leningradskaya oblast, 188350, Russia |
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| 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 Δ1～0.1ε F , with ε F being the Fermi level. We show that the critical temperature 2T c ?Δ1. If the pseudogap exists above T c , then 2T*?Δ1 and T* is the temperature at which the pseudogap vanishes. A discontinuity in the specific heat at T c is calculated. The transition from conventional superconductors to high-T c ones as a function of the doping level is investigated. The single-particle excitations and their lineshape are also considered |
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