Abstract
The electric conductivity of YBa2Cu3O7−δ ceramic high-Tc superconductors with different oxygen contents (6.28⩽7−δ⩽6.95) is measured in the temperature range ∼20–273 K. It is shown that the temperature dependence of the resistivity can be described by the relation ρ=α0(1+βT+eγ/T) at all oxygen concentrations. It is found that in the framework of resonant tunneling theory one can obtain information about the anisotropy of the electric conductivity of HTSCs from the results of experiments performed on polycrystalline samples.
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