Journal of Experimental and Theoretical Physics
Journal Issues
Golden Pages
About This journal
Aims and Scope
Editorial Board
Manuscript Submission
Guidelines for Authors
Manuscript Status

ZhETF, Vol. 146, No. 3, p. 631 (September 2014)
(English translation - JETP, Vol. 119, No. 3, p. 554, September 2014 available online at )

Plakida N.M., Oudovenko S.

Received: February 20, 2014

DOI: 10.7868/S0044451014090235

DJVU (200.5K) PDF (410.6K)

We study d-wave superconductivity in the extended Hubbard model in the strong correlation limit for a large intersite Coulomb repulsion V. We argue that in the Mott-Hubbard regime with two Hubbard subbands, there emerges a new energy scale for the spin-fluctuation coupling of electrons of the order of the electronic kinetic energy W much larger than the exchange energy J. This coupling is induced by the kinematic interaction for the Hubbard operators, which results in the kinematic spin-fluctuation pairing mechanism for V \lesssim W. The theory is based on the Mori projection technique in the equation of motion method for the Green's functions in terms of the Hubbard operators. The doping dependence of the superconductivity temperature Tc is calculated for various values of U and V.

Report problems