Abstract
A Green's function theory for the intensity of the Raman scattering by local magnon modes associated with magnetic impurities in antiferromagnetic insulators is presented. The theory explains quantitatively the strong enhancement of Mn impurity modes in the gap of antiferromagnetic FeF 2 . It is shown that the local mode intensity is strongly dependent on the competition between the nearest neighbor J ' 1 and the intersublattice J ' 2 Mn–Fe interaction parameters. This allows one to determine the interaction parameters from Raman scattering data. Application to FeF 2 :Mn yields J ' 1 = 0.8 cm −1 and J ' 2 = 1.96 cm −1 , both antiferromagnetic, confirming previous evidence that the two interactions compete in this system.
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