c-axis transport and phenomenology of the pseudo-gap state in $Bi_2Sr_2CaCu_2O_{8+δ}$

Details c-axis transport and phenomenology of the pseudo-gap state in $Bi_2Sr_2CaCu_2O_{8+δ}$ c-axis transport and phenomenology of the pseudo-gap state in $Bi_2Sr_2CaCu_2O_{8+δ}$

2004-07-15

arxiv.org/abs/cond-mat/0407403v1

Physics

Condensed Matter

Superconductivity

11 pages, 5 figures, submitted to Phys.Rev.B

Scientific paper

10.1103/PhysRevB.70.214530

We measure and analyze the resistivity of $Bi_2Sr_2CaCu_2O_{8+\delta}$ crystals for different doping $\delta$. We obtain the fraction of carrier $\eta(T,\delta) = n_g/n_{TOT}$ that do not participate to the c-axis conductivity. All the curves $\eta(T,\delta)$ collapse onto a universal curve when plotted against a reduced temperature $x=[T-\Theta(\delta)]/\Delta^{*}(\delta)$. We find that at the superconducting transition $n_g$ is doping independent. We also show that a magnetic field up to 14 T does not affect the degree of localization in the (a,b) planes but widens the temperature range of the x-scaling by suppressing the superconducting phase coherence.

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