Fluctuating order parameter in doped cuprate superconductors

Abstract

We discuss static fluctuations of the d-wave superconducting order parameter $\Delta$ in CuO${}_2$ planes, due to quasiparticle scattering by charged dopants. The analysis of two-particle anomalous Green functions at $T=0$ permits to estimate the mean-square fluctuation ${\delta }^2=<{\Delta }^2>-<\Delta {>}^2$, averaged in random dopant configurations, to the lowest order in doping level $c$. Since $\Delta$ is found to saturate with growing doping level while $\delta$ remains to grow, this can explain the collapse of $T_c$ at overdoping. Also we consider the spatial correlations $<\Delta (0)\Delta (\mathbf{R})>$ for order parameter in different points of the plane.

RevTex4, 3 pages, to be published in Proceedings of New3SC-4 International Conference, San Diego, California, January 15-21, 2003

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Cited by in corpus (1)

• Theory of THz Conductivity in the Pseudogap Phase of the Cuprates: A Pre-Formed Pair Perspective