The magnetic excitations in mixed crystals of Co 1-c Zn c F 2 with c=0.14+or-0.02, 0.31+or-0.03 and 0.77+or-0.10 have been measured using neutron inelastic scattering techniques. The results for the first two crystals show that the excitations decrease in frequency with increasing zinc concentration and also have a finite lifetime. For the crystal containing the largest concentration of ZnF 2 well defined magnetic excitations were not observed. These results are very similar to the predictions of the virtual lattice model in which each exchange interaction of CoF 2 is reduced by the concentration of CoF 2 in the mixed crystal. Reasonable agreement is also found with the results of calculations based on the single-site CPA approximation but the results do not clearly show that any one of the particular variants of this model gives a markedly better result than any of the other variants.
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Cowley et al. (1975) studied this question.
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