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Funct. Mater. 2019; 26 (3): 477-483.

doi:https://doi.org/10.15407/fm26.03.477

Effect of irradiation with fast electrons on the anisotropy of the magnetoresistance in YBa2Cu3O7-δ single crystals

V.I.Beletskyi, G.Ya.Khadzhai, N.R.Vovk, Yu.V.Litvinov, V.V.Sklyar, I.L.Goulatis

V.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine

Abstract: 

In this work, we investigated the influence of the misorientation angle between the direction of the constant magnetic field H = 15 kOe and the direction of the basal ab-plane on the temperature dependences of the excess conductivity in the region of transitions to the superconducting state of YBa2Cu3O7-δ single crystals irradiated with fast electrons at T << 10 (energy 0.5-2.5 MeV, dose 1018 cm-2). It was determined that at temperatures T >> Tc, the temperature dependences of the excess paraconductivity are interpreted within the framework of the Aslamazov-Larkin theoretical model of the fluctuation conductivity for layered superconducting systems. The reasons for the appearance of low-temperature "tails" (paracoherent transitions) on resistive transitions corresponding to different phase regimes of the vortex matter are discussed.

Keywords: 
excess conductivity, YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-&delta;</sub> single crystals, electron irradiation, 2D-3D crossover, &quot;intrinsic&quot; pinning.
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