Effect of electron irradiation on the transverse conductivity of YBa2Cu3O7–δ single crystal
G.Ya. Khadzhai, N.R. Vovk, and R.V. Vovk
V.N. Karazin Kharkiv National University, 4 Svobody sq., Kharkiv 61002, Ukraine
Received August 31, 2018, published online November 26, 2018
It is shown that the irradiation with electrons leads to the appearance in the sample of macroscopic (comparable with the thickness of the sample) fluctuations in the composition, which coexist with mesoscopic fluctuations. There was also a decrease in Тс due to a change in the oxygen deficit and / or the appearance of displaced Cu, Y, and Ba atoms. In the normal state, a mini-mum of resistance is observed, which shifts toward high temperatures after irradiation.
Key words: YBa2Cu3O7–δ, transverse resistivity, electron irradiation, diffuse phase transition, composition fluctuations, hopping conductivity.