To gain insight into the out-of-plane electrodynamics of high-Tc superconduct ors we have measured the absolute values and temperature dependence of the c-a xis magnetic penetration depth λc(T) for two typical single layer high -Tc cuprates, La2−xSrxCuO4 and HgBa2CuO4+x as a function o f doping. A distinct change in the behaviour of λc is observed near 0. 20 holes/Cu, which is related to the opening of the normal state pseudogap. The variation of λc with doping is qualitatively similar to that of the in -plane component, λab, which suggests that the c-axis superfluid r esponse is mainly governed by the superconducting condensation energy. The stron g doping dependence of λc(0) for p<0.20 provides an explanation for the discrepancies in the literature.
@article{arxiv.cond-mat/9911116,
title = {c-Axis Superfluid Response and Pseudogap in High-Tc Superconductors},
author = {C. Panagopoulos and J. R. Cooper and T. Xiang and Y. S. Wang and C. W. Chu},
journal= {arXiv preprint arXiv:cond-mat/9911116},
year = {2009}
}