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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 T₂ and the zero temperature excitation gap (0), as a function of hole concentration x, are in semiquantitative agreement with experiment. Although T₂/ (0) has a strong non-BCS x dependence, and (T) deviates significantly from the BCS prediction, we obtain, remarkably, quasiuniversal behavior for the superfluid density ₒ (T) /ₒ (0) and the Josephson critical current I₂ (T) /I₂ (0) as a function of T/T₂. Comparison with experiment is addressed.
Chen et al. (Mon,) studied this question.