Comparative analysis reveals distinct penetration depth scaling patterns across layered superconductors, indicating anomalous condensate energy enhancement in underdoped cuprates.
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. An 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 from well-defined quasiparticles, and the other seen in systems in which the quasiparticles are not well defined. The latter pattern is found primarily in underdoped cuprates, and indicates a dramatic enhancement (a 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.
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Dordevic et al. (2002) studied this question.
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