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The influence of irradiation by electrons with energies of $0.5-2.5$\,MeV attemperatures of about $10$\,K on the basal-plane resistivity of theYBa$_2$Cu$_3$O$_{7-\delta}$ single crystals is investigated in the range from$T_c$ to $300$\,K. The resistivity temperature dependence is determined bydefects arising due to the irradiation. These defects directly affect thesuperconducting transition, decreasing $T_c$ and increasing the transitionwidth without significant distortions of its shape. The resulting defects alsolead to an increase in the Debye temperature due to a reduction of theanisotropy, and a noticeable increase in the scattering by phonons in thesample. The excess conductivity does not change with the irradiation used.

Effect of electron irradiation and Pr doping on the charge transport in YBCO single crystals