Effects of Superconductivity and Charge Order on the sub-Terahertz reflectivity of La${}_{1.875}$Ba${}_{0.125-y}$Sr${}_y$CuO${}_4$

M. Ortolani, P. Calvani, S. Lupi +4

The reflectivity $R(\omega )$ of both the $ab$ plane and the c axis of two single crystals of La${}_{1.875}$Ba${}_{0.125-y}$Sr${}_y$CuO${}_4$ has been measured down to 5 cm${}^{-1}$, using cohe…