Low Temperature Physics: 38, 874 (2012); https://doi.org/10.1063/1.4752091 (6 pages)
Fizika Nizkikh Temperatur: Volume 38, Number 9 (September 2012), p. 1102-1108    ( to contents , go back )

Kohn-Luttinger effect and anomalous pairing in repulsive Fermi-systems at low density (Review Article)

M.Yu. Kagan1, D.V. Efremov2, M.S. Mar’enko3, and V.V. Val’kov4

1Kapitza Institute for Physical Problems, Kosygin Str. 2, Moscow 19334, Russia
E-mail: kagan@kapitza.ras.ru

2Max -Planck-Institut für Festkörperforschung, Stuttgart D-70569, Germany

3Department of Physics and Astronomy, Hofstra University, Hempstead, New York 11549, USA

4Kirenskii Institute of Physics, Krasnoyarsk 660036, Russia
pos Анотація:

Received April 11, 2012

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 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 spinpolarized 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 ~ 100 K which arises in the extended Hubbard model and in the generalized t-J model close to half-filling.

PACS: 71.27.+а Strongly correlated electron systems; heavy fermions;
PACS: 71.10.–w Theories and models of many-electron systems.

Key words: Fermi-gas model, superconductivity, 3D and 2D Hubbard model.

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