Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1785884 | Current Applied Physics | 2015 | 5 Pages |
Abstract
Measured is the transverse electrical resistance of YBa2Cu3O7âδ single crystals with different oxygen deficiency values (δ) in the temperature range Tc â 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 non-homogeneity. 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.
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Authors
R.V. Vovk, G.Ya. Khadzhai, O.V. Dobrovolskiy, Z.F. Nazyrov, A. Chroneos,