Zero temperature dynamic structure factor for a classical RKKY model of CuMn

We report the results of calculations of the zero temperature dynamic structure factor of a classical RKKY model of a metallic spin glass resembling CuMn (0.9 at.%). Our studies show that for the wave vectors considered, q=0.12 (1,1,1) Å−1 and 0.62 (1,1,1) Å−1, the spectral weight is largely confined to the region E?Ep where Ep is the peak in the density of states. Within the limits of the numerical analysis we find no evidence for propagating modes. We make use of our calculations in interpreting recent inelastic neutron scattering studies carried out on CuMn by Scheuer et al. The inelastic peak they observe is identified with the maximum in the density of states.