Probing quasiparticle dynamics in Bi2Sr2CaCu2O(8+delta) with a driven Josephson vortex lattice

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We show that the flux-flow transport of the Josephson vortex lattice (JVL) in layered high-temperature superconductors provides a convenient probe for both components of quasiparticle conductivity, σc and σab. We found that the JVL flux-flow resistivity, ρff, in a wide range of magnetic fields is mainly determined by the in-plane dissipation. In the dense lattice regime (B>1 T) ρff(B) dependence is well fitted by the theoretical formula for that limit. That allows us to independently extract from the experimental data the values of σc and of the ratio σab/(σcγ⁴). The extracted temperature dependence σab(T) is consistent with microwave data. The shape of the current-voltage characteristics is also sensitive to the frequency dependence of σab and that allows us to estimate the quasiparticle relaxation time and relate it to the impurity bandwidth using data obtained for the same crystal.