The effect of twin boundaries on the normal and fluctuation conductivity of REBa₂Cu₃O_7-δ (RE=Y, Ho) single crystals has been investigated. The temperature dependence of the excess conductivity can be satisfactory described by the Lawrence-Doniach theoretical model. The twin boundaries are efficient scattering centers of normal and fluctuation carriers. The predicted values of the coherence length perpendicular to the ab-plane ξ_c(0) are in good agreement with the values determined from the magnetic measurements of stoichiometric YBaCuO crystals.

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