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Regular version of the site

Article

High-T-c and low T-c superconductivity and superfluidity in Fermi-systems with repulsion

Journal of Superconductivity and Novel Magnetism. 2016. Vol. 29. No. 4. P. 1043-1048.
Kagan M., Mitskan V., Korovushkiin M.

We demonstrate the instability of the normal state of purely repulsive fermionic systems towards the transition to the Kohn-Luttinger superconducting state. We construct the superconducting phase diagrams of these systems in the framework of the Hubbard and Shubin-Vonsovsky models on the square and hexagonal lattices. We show that an account for the long-range Coulomb interactions, as well as the Kohn- Luttinger renormalizations, lead to an increase in the critical superconducting temperatures in various materials, such as high-temperature superconductors, idealized monolayer, and bilayer of doped graphene. Additionally, we discuss the role of the structural disorder and the nonmagnetic impurities in superconducting properties of real graphene systems.