Global trends in the interplane penetration depth of layered superconductors

الأصل · EN

We report on generic trends in the behavior of the interlayer penetration depth λc of several different classes of quasi two-dimensional superconductors including high-Tc 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 c-axis DC conductivity σDC: one realized in the systems with a ground state formed out of well defined quasiparticles and the other seen in systems in which the quasiparticles are not well defined. 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 conventional materials. We discuss the implication of these results on the understanding of superconductivity in high-Tc cuprates.