The paramagnetic state of BCC iron

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Abstract
Calculations are reported of the static and dynamic properties of an effective Heisenberg model of Fe with exchange interactions extending to fifth-nearest neighbours. Exchange parameters chosen to fit the spin wave dispersion curve at room temperature lead to little short-range order above Tc and to a neutron scattering function S(q, omega ) which is compatible with Lynn's 'constant omega ' plots. The dispersion curve obtained by plotting the positions of peaks in 'constant omega ' plots is in excellent agreement with the observed one but it does not correspond to propagating spin waves above Tc. The authors' results do not, however, reproduce the observed rapid drop of intensity at low frequency in 'constant q' scans.

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