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The recently discovered structural reconstruction in the cuprate superlattice(SrCuO$_2$)$_n$/(SrTiO$_3$)$_2$ has been investigated across the critical valueof $n=5$ using resonant inelastic x-ray scattering (RIXS). We find that at thecritical value of $n$, the cuprate layer remains largely in the bulk-liketwo-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 inelectron-doped cuprate superconductors do not show this quenching of magneticexcitations.

Quenched Magnon excitations by oxygen sublattice reconstruction in (SrCuO$_2$)$_n$/(SrTiO$_3$)$_2$ superlattices