Far-infrared transmittance spectra of Mn 1-x Zn x F 2 have been obtained at 1.2K in the frequency region from 3-15 cm -1 for x values from 0 to 0.49. The antiferromagnetic resonance frequency is observed to drop nearly linearly from the 8.7 cm -1 value for MnF 2 to 4.0 cm -1 at 40% ZnF 2 . The linewidth broadened from <<1 cm -1 to approximately 2 cm -1 . Resonance frequencies obtained are compared with those from recent neutron scattering measurements.
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Tennant et al. (1977) studied this question.
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