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Effect of high pressure on the fluctuation paraconductivity in Y0.95Pr0.05Ba2Cu3O7-d single crystals
R.V. Vovk,N.R. Vovk,G.Ya Khadzhai,O.V. Dobrovolskiy,Z.F. Nazyrov 한국물리학회 2014 Current Applied Physics Vol.14 No.12
The effect of high hydrostatic pressure up to 17 kbar on the fluctuation conductivity of lightly Pr-doped Y1xPrxBa2Cu3O7d (x z 0.05) single crystals is investigated. We show that in contrast to non-doped YBa2Cu3O7d samples, application of a high pressure leads to a substantial increase of the pressure derivative of the coherence length dxc/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.
Transverse resistance of YBa2Cu3O7-δ single crystals
R.V. Vovk,G.Ya Khadzhai,O.V. Dobrovolskiy,Z.F. Nazyrov,A. Chroneos 한국물리학회 2015 Current Applied Physics Vol.15 No.5
Measured is the transverse electrical resistance of YBa2Cu3O7-δ single crystals with different oxygen deficiency values (δ) in the temperature range Tc - 300 K. The experimental data are approximated by an empiric expression accounting for the fluctuation conductivity near Tc and the semiconductor-like resistance regime. Our analysis of the concentration dependences of the fitting parameters, in particular, reveals that the resistance temperature dependence is largely affected by the sample's nonhomogeneity. The latter, in turn, causes a Tc anisotropy and variable-range hopping conductivity between different phases. The deduced maximal values of the basal-plane coherence length, ξxy(0), are comparable with those for low-temperature superconductors.