Breakdown of the universal Josephson relation in spin ordered cuprate superconductors

Abstract

We present \emph{c} axis infrared optical data on a number of Ba, Sr and Nd-doped cuprates of the La${}_2$CuO${}_4$ (La214) series in which we observe significant deviations from the universal Josephson relation linking the normal state transport (DC conductivity ${\sigma }_{DC}$ measured at $T_c$) with the superfluid density (${\rho }_s$): ${\rho }_s\propto {\sigma }_{DC}(T_c)$. We find the violation of Josephson scaling is associated with striking enhancement of the anisotropy in the superfluid density. The data allows us to link the breakdown of Josephson interlayer physics with the development of magnetic order in the CuO${}_2$ planes.

5 pages, 3 figures

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