Exchange and spin-fluctuation superconducting pairing in cuprates

Details Exchange and spin-fluctuation superconducting pairing in cuprates Exchange and spin-fluctuation superconducting pairing in cuprates

2001-04-12

arxiv.org/abs/cond-mat/0104234v4

JETP vol 97, 331 (2003)

Physics

Condensed Matter

Superconductivity

13 pages, 2 figures, Revtex ; major rewritting to improve clarity

Scientific paper

We propose a microscopical theory of superconductivity in CuO$_2$ layer within the effective two-band Hubbard model in the strong correlation limit. By applying a projection technique for the matrix Green function in terms of the Hubbard operators, the Dyson equation is derived. It is proved that in the mean-field approximation d-wave superconducting pairing mediated by the conventional exchange interaction occurs. Allowing for the self-energy corrections due to kinematic interaction, a spin-fluctuation d-wave pairing is also obtained. $T\sb{c}$ dependence on the hole concentration and $\bf k$-dependence of the gap function are derived. The results show that the exchange interaction (which stems from the interband hopping) prevails over the kinematic interaction (which stems from the intraband hopping).

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