Pairing Fluctuation Theory of Superconducting Properties in Underdoped to Overdoped Cuprates

Abstract

We propose a theoretical description of the superconducting state of under- to overdoped cuprates, based on the short coherence length of these materials and the associated strong pairing fluctuations. The calculated $T_c$ and the zero temperature excitation gap $\Delta (0)$, as a function of hole concentration $x$, are in semi-quantitative agreement with experiment. Although the ratio $T_c/\Delta (0)$ has a strong $x$ dependence, different from the universal BCS value, and $\Delta (T)$ deviates significantly from the BCS prediction, we obtain, quite remarkably, quasi-universal behavior, for the normalized superfluid density ${\rho }_s(T)/{\rho }_s(0)$ and the Josephson critical current $I_c(T)/I_c(0)$, as a function of $T/T_c$. While experiments on ${\rho }_s(T)$ are consistent with these results, future measurements on $I_c(T)$ are needed to test this prediction.

arXiv comment4 pages, 3 figures, REVTeX, submitted to Phys. Rev. Lett

References in corpus (4)

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• Pseudogap effects induced by resonant pair scattering
• On the Relationship Between the Pseudo- and Superconducting Gaps: Effects of Residual Pairing Correlations Below Tc
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