Breakdown of the universal Josephson relation in spin ordered cuprate superconductors

A. A. Schafgans, C. C. Homes, G. D. Gu +3

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 t…