Quenched Magnon excitations by oxygen sublattice reconstruction in   (SrCuO$_2$)$_n$/(SrTiO$_3$)$_2$ superlattices
  The recently discovered structural reconstruction in the cuprate superlattice (SrCuO$_2$)$_n$/(SrTiO$_3$)$_2$ has been investigated across the critical value of $n=5$ using resonant inelastic x-ray scattering (RIXS). We find that at the critical value of $n$, the cuprate layer remains largely in the bulk-like two-dimensional structure with a minority of Cu plaquettes being reconstructed. The partial reconstruction leads to quenching of the magnons starting at the $\Gamma$-point due to the minority plaquettes acting as scattering points. Although comparable in relative abundance, the doped charge impurities in electron-doped cuprate superconductors do not show this quenching of magnetic excitations. 
M. Dantz, J. Pelliciari, D. Samal, V. Bisogni, Y. Huang, P.   Olalde-Velasco, V. N. Strocov, G. Koster, and T. Schmitt
cond-mat.str-el