2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16482Nonmagnetic Zn impurities are known to strongly suppress superconductivity. We review their effects on the spin excitation spectrum in $\rm YBa_2Cu_3O_{7}$, as investigated by inelastic neutron scattering measurements.Proceedings of Mato Advanced Research Workshop BLED 2000. To appear in Nato Science Series: B PhysicsSuperconductivityStrongly Correlated Electronstext