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Interplane Transport and Superfluid Density in Layered Superconductors

S. V. Dordevic·E. J. Singley·D. N. Basov·J. H. Kim·M. B. Maple·E. Bucher
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Abstract

We report on generic trends in the behavior of the interlayer penetration depth $λ_c$ of several different classes of quasi two-dimensional superconductors including cuprates, Sr$_2$RuO$_4$, 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 $λ_c$ 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 $\simeq 10^2$) of the energy scale $Ω_C$ 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-$T_c$ cuprates.

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S. V. Dordevic, E. J. Singley, D. N. Basov, J. H. Kim, M. B. Maple, E. Bucher. 2001-02-25. Interplane Transport and Superfluid Density in Layered Superconductors. https://doi.org/10.1103/physrevb.65.134511

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