Superconductivity in repulsive Fermi-systems at low density

Details Superconductivity in repulsive Fermi-systems at low density Superconductivity in repulsive Fermi-systems at low density

2011-11-14

arxiv.org/abs/1111.3230v1

Physics

Condensed Matter

Superconductivity

12 pages 11 figures, accepted for publication in Journal of Superconductivity and Novel Magnetism, based on invited talks on G

Scientific paper

In the large variety of models such as 3D and 2D Fermi-gas model with hard-core repulsion, 3D and 2D Hubbard model, and Shubin-Vonsovsky model we demonstrate the possibility of triplrt 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 observable values of (1-5)K. We also discuss briefly d-wave pairing and high-Tc superconductivity with Tc~100K which arises in the t-J model in the range of parameters realistic for cuprates.

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