Fluctuation Effect in Superconductivity in an Electron Model with d-Wave Attraction

2001/07/05 by Xin-Zhong Yan, Yan, Xin-Zhong
Physics and Astronomy · #FOS: Physical sciences #Superconductivity (cond-mat.supr-con) #cond-mat.supr-con

paper · pdf · doi:10.48550/arxiv.cond-mat/0107099

4 pages, 4 figures

arxiv created 2001/10/17 · arxiv updated 2009/11/30

Abstract

On the basis of t-matrix approximation, we study the superconductivity in the tight-binding model with d-wave attraction. The low-lying collective modes are considered as the predominant long-range fluctuations in the system. The Green's function is obtained as an analytic solution to a cubic equation. The superconducting order parameter and the transition temperature are substantially reduced from the values of the mean-field theory. The results for the pseudogap parameter at T_c are compared with experiments. The calculated phase boundary of the superconductivity can reasonably describe the experiment results for the cuprates. The results for density of states are presented.

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