Universal behavior of the in-plane paraconductivity of cuprate superconductors in the short-wavelength fluctuation regime

Abstract

The in-plane paraconductivity was measured in the so-called high reduced-temperature region [for ɛ≡ln(T/TC) well above 0.1] in high-quality single crystals or epitaxial thin films of highly anisotropic cuprate superconductors with different number of superconducting layers per periodicity length. Although the high-ɛ behavior of the paraconductivity cannot be described in terms of a critical exponent in ɛ, in all the cases we observe the same type of rapid fall-off at the same (well within the experimental uncertainties) reduced-temperature ɛC≃0.7. These results may be explained in terms of the multilayered Gaussian-Ginzburg-Landau approach by taking into account that due to the uncertainty principle also above TC the superconducting coherence length cannot be appreciably smaller than at T=0 K.

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