Abstract
We present a phenomenological model for the electrical transport in double-layered cuprates, based on the existence of two energy barriers along the c-axis. The model is applied to measurements of the dc resistivity in Bi 2Sr 2CaCu 2O 8+ δ single crystals. We find that the model gives a comprehensive description of the out-of-plane normal resistivity ρ c at various doping δ. Once the normal state has been determined, it is possible to obtain the fraction η( T, δ) of the carriers that, below the pseudogap temperature T ∗, do not participate to the c-axis conductivity. We find that all the curves η( T, δ) collapse onto a single universal curve η[ T/ T ∗( δ)].
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