Physics – Condensed Matter – Superconductivity
Scientific paper
2003-07-18
Phys. Rev. B 68, 134504 (2003)
Physics
Condensed Matter
Superconductivity
11 pages, 8 figures, subm. Phys. Rev. B
Scientific paper
10.1103/PhysRevB.68.134504
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, $\sigma_{c}$ and $\sigma_{ab}$. We found that the JVL flux-flow resistivity, $\rho_{ff}$, in a wide range of magnetic fields is mainly determined by the in-plane dissipation. In the dense lattice regime ($B>1$ T) $\rho_{ff}(B)$ dependence is well fitted by the theoretical formula for that limit. That allows us to independently extract from the experimental data the values of $\sigma_{c}$ and of the ratio $\sigma _{ab}/(\sigma_{c}\gamma ^{4})$. The extracted temperature dependence $\sigma _{ab}(T)$ is consistent with microwave data. The shape of the current-voltage characteristics is also sensitive to the frequency dependence of $\sigma_{ab}$ and that allows us to estimate the quasiparticle relaxation time and relate it to the impurity bandwidth using data obtained for the same crystal.
Bulaevskii Lev N.
Koshelev Alexei E.
Latyshev Yu. I.
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