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Статья

Superconductivity in Repulsive Fermi-Systems at Low Density

Journal of Superconductivity and Novel Magnetism. 2013. Vol. 26. No. 5. P. 2809-2815.
M.Y. Kagan, Efremov D., Mar’enko M., Val’kov V.

Abstract. In the large variety of models such as 3D and 2D Fermi-gas model with hard-core repulsion, 3D and 2D Hubbard model, and the Shubin–Vonsovsky model, we demonstrate the possibility of triplet p-wave pairing at low electron density. We show that the critical temperature of the p-wave pairing can be strongly increased in a spin-polarized case or in a two-band situation already at low density and reach experimentally feasible values of (1–5) K. We also discuss briefly d-wave pairing and high-TC superconductivity with TC ∼ 100 K, which arises in the 2D t-J model in the range of parameters realistic for cuprates.