Abstract

The two-dimensional antiferromagnetic spin-1/2 Heisenberg model on a square lattice is considered in the presence of randomly distributed vacancies and magnetic impurities. We calculate the configurationally averaged spin excitations of the system in the limit of small impurity concentrations. We apply linear spin-wave theory to the host and use the exact T matrix for the impurity sites. Results for the spin-wave spectrum are presented. These include resonant scattering effects, the renormalized spin-wave dispersion, and the spin-wave damping.

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