Spin-fluctuation mechanism of superconductivity in cuprates

Details Spin-fluctuation mechanism of superconductivity in cuprates Spin-fluctuation mechanism of superconductivity in cuprates

2005-02-02

arxiv.org/abs/cond-mat/0502044v1

Phys. Rev. B 72, 012510 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Color figures

Scientific paper

10.1103/PhysRevB.72.012510

The theory of superconductivity within the t-J model, as relevant for cuprates, is developed. It is based on the equations of motion for projected fermionic operators and the mode-coupling approximation for the self-energy matrix. The dynamical spin susceptibility at various doping is considered as an input, extracted from experiments. The analysis shows that the superconductivity onset is dominated by the spin-fluctuation contribution. We show that T_c is limited by the spin-fluctuation scale $\Gamma$ and shows a pronounced dependence on the next-nearest-neighbor hopping t'. The latter can offer an explanation for the variation of T_c among different families of cuprates.

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