Breakdown of the universal Josephson relation in spin ordered cuprate superconductors

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We present c axis infrared optical data on a number of Ba, Sr and Nd-doped cuprates of the La₂CuO₄ (La214) series in which we observe significant deviations from the universal Josephson relation linking the normal state transport (DC conductivity σDC measured at Tc) with the superfluid density (ρₛ): ρₛ∝σDC(Tc). 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 CuO₂ planes.