Pairing-fluctuation effect in quasi-two-dimensional superconductivity

Details Pairing-fluctuation effect in quasi-two-dimensional superconductivity Pairing-fluctuation effect in quasi-two-dimensional superconductivity

2002-01-22

arxiv.org/abs/cond-mat/0201382v3

Physics

Condensed Matter

Superconductivity

9 pages, 1 figure, 2 tables

Scientific paper

10.1142/S021797920301598X

We present a self-consistent approach to deal with the pairing-fluctuation effects in quasi-two-dimensional superconducting systems. Besides the Cooper pairs in the Bose-Einstein condensate, there are pairs occupying the excited states, which results in the predominant fluctuations. The low-lying excited states are the collective modes. On the basis of ladder-diagram approximation, we treat the single particles and the pairs on an equal-footing manner. The Green's function of single particles is obtained as an analytic solution to a cubic equation. The bosonic degrees of freedom are relevant to the pseudogap physics in the high-T_c cuprates. The superconducting order parameter and the transition temperature are substantially reduced from the values of the mean-field theory. The calculated phase boundary of superconducting state can reasonably describe the experiment data for cuprates.

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