Influence of uniform compression on fluctuation paraconductivity of single crystals Y_0.77Pr_0.23Ba₂Cu₃O_7–δ

The work investigated the effect of high hydrostatic pressure up to 12 kbar on the fluctuation conductivity of medium-doped praseodymium (x ≈ 0.23) single-crystal Y_1–xPr_xBa₂Cu₃O_7–δ samples. It was found that in contrast to the pure YBa₂Cu₃O_7–δ samples and the Y_0.95Pr_0.05Ba₂Cu₃O_7–δ samples lightly doped with praseodymium, the application of high pressure leads to a significant decrease in the transverse coherence length ξ_c and an increase in the baric derivative dT_c/dP. Possible mechanisms of the effect of high pressure on the critical temperature and coherence length in the bulk of the experimental sample are discussed. (author)