Low Temperature Physics: 32, 363 (2006); https://doi.org/10.1063/1.2199437 (12 pages)
Fizika Nizkikh Temperatur: Volume 32, Number 4-5 (April 2006), p. 483-498    ( to contents , go back )

Theory of antiferromagnetic pairing in cuprate superconductors

N.M. Plakida

Joint Institute for Nuclear Research, 141980 Dubna, Russia
E-mail: plakida@htsun1.jinr.ru
pos Анотація:

Received September 15, 2005

Abstract

A review of the antiferromagnetic exchange and spin-fluctuation pairing theory in the cuprate superconductors is given. We briefly discuss a phenomenological approach and a theory in the limit of weak Coulomb correlations. A microscopic theory in the strong correlation limit is presented in more detail. In particular, results of our recently developed theory for the effective p–d Hubbard model and the reduced t–J model are given. We have proved that retardation effects for the antiferromagnetic exchange interaction are unimportant that results in pairing of all charge carriers in the conduction band and high Tc proportional to the Fermi energy. The spin-fluctuation interaction caused by kinematic interaction gives an additional contribution to the d-wave pairing. Dependence of Tc on the hole concentration and the lattice constant (or pressure) and an oxygen isotope shift are discussed.

PACS:
74.20.-z - Theories and models of superconducting state
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
74.72.-h - Cuprate superconductors (high-Tc and insulating parent compounds)

Key words: high-temperature superconductivity, strong electron correlations, Hubbard model, antiferromagnetic exchange interaction, spin-fluctuations.

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