We report on generic trends in the behavior of the interlayer penetration depth λc of several different classes of quasi two-dimensional superconductors including cuprates, Sr2RuO4, transition metal dichalcogenides and organic materials of the (BEDT−TTF)2X-series. Analysis of these trends reveals two distinct patterns in the scaling between the values of λc and the magnitude of the DC conductivity: one realized in the systems with a Fermi liquid (FL) ground state and the other seen in systems with a marked deviation from the FL response. The latter pattern is found primarily in under-doped cuprates and indicates a dramatic enhancement (factor ≃102) of the energy scale ΩC associated with the formation of the condensate compared to the data for the FL materials. We discuss implications of these results for the understanding of pairing in high-Tc cuprates.
@article{arxiv.cond-mat/0102455,
title = {Interplane Transport and Superfluid Density in Layered Superconductors},
author = {S. V. Dordevic and E. J. Singley and D. N. Basov and J. H. Kim and M. B. Maple and E. Bucher},
journal= {arXiv preprint arXiv:cond-mat/0102455},
year = {2015}
}