c-Axis Superfluid Response and Pseudogap in High-Tc Superconductors

Details c-Axis Superfluid Response and Pseudogap in High-Tc Superconductors c-Axis Superfluid Response and Pseudogap in High-Tc Superconductors

1999-11-09

arxiv.org/abs/cond-mat/9911116v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.61.R3808

To gain insight into the out-of-plane electrodynamics of high-$T_c$ superconduct ors we have measured the absolute values and temperature dependence of the c-a xis magnetic penetration depth $\lambda_c(T)$ for two typical single layer high -$T_c$ cuprates, La$_{2-x}$Sr$_x$CuO$_4$ and HgBa$_2$CuO$_{4+x}$ as a function o f doping. A distinct change in the behaviour of $\lambda_c$ is observed near 0. 20 holes/Cu, which is related to the opening of the normal state pseudogap. The variation of $\lambda_c$ with doping is qualitatively similar to that of the in -plane component, $\lambda _{ab}$, which suggests that the c-axis superfluid r esponse is mainly governed by the superconducting condensation energy. The stron g doping dependence of $\lambda_c(0)$ for p<0.20 provides an explanation for the discrepancies in the literature.

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