Effect of high pressure on the fluctuation paraconductivity in Y0.95Pr0.05Ba2Cu3O7-δ single crystals

The effect of high hydrostatic pressure up to 17 kbar on the fluctuation conductivity of lightly Pr-doped Y1-xPrxBa2Cu3O7-delta (x approximate to 0.05) single crystals is investigated. We show that in contrast to non-doped YBa2Cu3O7-delta samples, application of a high pressure leads to a substantial increase of the pressure derivative of the coherence length d xi(c)/dP and a temperature shift of the 2D-3D crossover point. Possible mechanisms of the influence of high pressure on the critical temperature and the coherence length are discussed within the framework of a model assuming the presence of singularities in the charge carriers electron spectrum typical for lattices with strong coupling. (C) 2014 Elsevier B.V. All rights reserved.