Interplane Transport and Superfluid Density in Layered Superconductors

• Main Authors: Dordevic, S. V, Singley, E. J, Basov, D. N, Kim, J. H, Maple, M. B, Bucher, E
• Format: Journal Article
• Language: English
• Published: 25.02.2001
• Subjects: Physics - Superconductivity
• DOI: 10.48550/arxiv.cond-mat/0102455

Phys.Rev.B Vol.65, 134511 (2002). We report on generic trends in the behavior of the interlayer penetration depth $\lambda_c$ 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 $\lambda_c$ 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 $\Omega_C$ 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.