Funct. Mater. 2023; 30 (4): 463-470.
Influence of irradiation and impurity defects on the fluctuation conductivity of YBa2Cu3O7-δ single crystals
1V.N. Karazin Kharkiv National University, 61022, Svoboda Sq. 4, Kharkiv, Ukraine
2Department of Electrical and Computer Engineering, University of Thessaly, 38333 Volos, Greece
3Department of Materials, Imperial College London, London SW7 2BP, United Kingdom
4B.Verkin Institute for Low Temperature Physics and Engineering of NAS of Ukraine, Kharkiv, 61103, Ukraine
5Centre of Low Temperature Physics, Faculty of Science,P.J. Safarik University, Park Angelinum 9, 041 54 Kosice, Slovakia
6Ukrainian State University of Railway Transport, 61050, Feierbakh Sq. 7, Kharkiv, Ukraine
The effect of medium doses (from 1019 е/cm2to 1020 е/cm2) of fast electron irradiation and the change in the praseodymium concentration in the range 0.0 ≤ z ≤ 0.5 on the excess conductivity of optimally oxygen-doped YBa2Cu3O7-δ single crystals has been investigated. It was determined that electron irradiation and an increase in the degree of doping with praseodymium leads to a significant expansion of the temperature interval of excess conductivity existence, thereby narrowing the region of the linear dependence ρ(Т) in the ab plane. It was determined that at doses 0≤D≤6.5·1019 е/cm2, the value of the transverse coherence length ξс(0) increases with an increase of D by about 3 times and more than four times as the content of praseodymium in the sample increases to z ≈ 0.42. In both cases, the 2D-3D crossover point shifts upward in temperature. In contrast to the case of irradiation with low doses (D≤1019 е/cm2) and doping with praseodymium up to concentrations z ≤ 0.39, irradiation with medium doses and doping with praseodymium at higher concentrations leads to a nonmonotonic dependence of the transverse coherence length ξс(0) on the irradiation dose, with characteristic maxima at D~(7-8)·1019 е/cm2 and z≈0.42, which may be due to the general suppression of the superconducting characteristics.
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