The effect of medium doses (from 10<^>19 to 10<^>20 cm<^>-2) of irradiation with fast electrons (energy, E = 2,5 MeV) on the excess conductivity of optimally doped <$E roman {Y sub 1 Ba sub 2 Cu sub 3 O sub {7- delta}}> single crystals has been studied. It is shown that the irradiation with electrons leads to the significant expansion of the temperature interval for the existence of excess conductivity, thereby narrowing the region of the <$E rho>(T) linear dependence in the ab plane in the normal state. It has been established that at doses of 0 <<= D <<= 6,5 x 10<^>19 cm<^>-2, the value of the transverse coherence length <$E xi sub c >(0) increases with D by about 3 times and the 2D - 3D crossover point shifts in temperature. In contrast to the case of irradiation with low doses (D <<= 10<^>19 cm<^>-2), irradiation with medium doses leads to a nonmonotonic dependence of the transverse coherence length <$E xi sub c> (0) on the irradiation dose, with a characteristic maximum at D ~ (7 - 8) x 10<^>19 cm<^>-2, which may be related to the general suppression of superconducting characteristics.

• Азарєнков Микола Олексійович (1951–) (фізико-математичні науки)
• Геворкян Едвін Спартакович (1960–) (технічні науки)
• Вовк Руслан Володимирович (1966–) (фізико-математичні науки)

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