Abstract
Abstract We have investigated the conductivity in the basis plane of YBaCuO single crystals slightly doped by Al and Pr with a pre-specified topology of twin boundaries. The excess conductivity for the analyzed samples shows dependence Δ σ ∼ ( 1 - T / T * ) exp ( Δ ab * / T ) in a wide temperature range T f T T * , where T * is the mean field temperature of superconducting transition. The temperature dependence of the pseudogap can be satisfactorily described in terms of the BCS–BEC crossover theoretical model.
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