Coexistence of the superconducting energy gap and pseudogap above and below the transition temperature of superconducting cuprates
Abstract
We express the superconducting gap, (T), in terms of thermodynamic functions in both s- and d-wave symmetries. Applying to Bi2Sr2CaCu2O8+δ and Y0.8Ca0.2Ba2Cu3O7-δ we find that for all dopings (T) persists, as a partial gap, high above Tc due to strong superconducting fluctuations. Therefore in general two gaps are present above Tc, the superconducting gap and the pseudogap, effectively reconciling two highly polarized views concerning pseudogap physics.
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