30 August 2005 Spin-fluctuation mechanism of superconductivity in cuprates
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Normal and superconducting state spectral properties of cuprates are theoretically described within the extended t-J model. The method 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 onset of superconductivity is dominated by the spin-fluctuation contribution. The coupling to spin fluctuations directly involves the next-nearest-neighbor hopping t', hence Tc shows a pronounced dependence on t'. The latter can offer an explanation for the variation of Tc among different families of hole-doped cuprates. A formula for maximum Tc is given and it is shown that optimum doping, where maximum Tc is reached, is with increasing -t' progresively increased.
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A. Ramsak, A. Ramsak, P. Prelovsek, P. Prelovsek, } "Spin-fluctuation mechanism of superconductivity in cuprates", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59320G (30 August 2005); doi: 10.1117/12.621848; https://doi.org/10.1117/12.621848

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