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Proceedings Paper

Spin-fluctuation mechanism of superconductivity in cuprates
Author(s): A. Ramsak; P. Prelovsek
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Paper 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 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.

Paper Details

Date Published: 30 August 2005
PDF: 9 pages
Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 59320G (30 August 2005); doi: 10.1117/12.621848
Show Author Affiliations
A. Ramsak, Univ. of Ljubljana (Slovenia)
J. Stefan Institute (Slovenia)
P. Prelovsek, Univ. of Ljubljana (Slovenia)
J. Stefan Institute (Slovenia)

Published in SPIE Proceedings Vol. 5932:
Strongly Correlated Electron Materials: Physics and Nanoengineering
Ivan Bozovic; Davor Pavuna, Editor(s)

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