2001/09/01 by M. Ya. Amusia, S. A. Artamonov, V. R. Shaginyan · 2 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1134/1.1427130
published as JETP Lett. 74, 396 (2001) · 6 pages, Revtex
arxiv created 2001/09/01 · openalex publication_date 2001/10/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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