Spin-fluctuation mechanism of superconductivity in cuprates

A. Ramsak; P. Prelovsek

doi:10.1117/12.621848

30 August 2005 Spin-fluctuation mechanism of superconductivity in cuprates

A. Ramsak, P. Prelovsek

Proceedings Volume 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering; 59320G (2005) https://doi.org/10.1117/12.621848
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

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 T_c shows a pronounced dependence on t'. The latter can offer an explanation for the variation of T_c among different families of hole-doped cuprates. A formula for maximum T_c is given and it is shown that optimum doping, where maximum T_c is reached, is with increasing -t' progresively increased.

Citation Download Citation

A. Ramsak and P. Prelovsek "Spin-fluctuation mechanism of superconductivity in cuprates", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59320G (30 August 2005); https://doi.org/10.1117/12.621848

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