The effect of high-energy electron irradiation on the superconducting transition and anisotropy of the electrical resistance of YВа2Сu3О7–δ single crystals
G.Ya. Khadzhai, A.V. Samoilov, and R.V. Vovk
V.N. Karazin Kharkiv National University, 4 Svobody Square, Kharkiv 61022, Ukraine
Received March 14, 2019, revised November 11, 2019, published online April 24, 2020
The temperature dependences of the longitudinal and transverse conductivity of YBa2Cu3O7–δ single crystals irradiated with high-energy electrons were measured. It was found that, in contrast to unirradiated YBa2Cu3O7–δ single crystals, the absolute value of the anisotropy of the normal electrical resistance ρс/ρab significantly decreases with an increase in the number of struc-tural defects in the volume of the experimental sample. In this case, the dependence ρс/ρab(Т) is well described both by means of the universal “law 1/2” and the usual exponential expression for thermally activated conductivity.
Key words: YBa2Cu3O7–δ single crystals, conductivity anisotropy, irradiation, thermally activated conductivity.