Spin Dynamics of Paramagnetic Iron

Abstract

The spin dynamics of the classical Heisenberg model on the bcc lattice is computed with a Monte Carlo molecular-dynamics approach in the paramagnetic phase at $T=1.025\mathrm{}{T}_c$ and $1.275T_c$. The resulting scattering function $S(q,w)\mathrm{}$ and its integral over restricted energy windows are computed and compared with the recent neutron-scattering experiments on iron. Reasonable overall agreement with much of the experimental data is found.