Abstract
To study the effects of short-range order on paramagnetic lineshapes, we have computed temperature-dependent frequency moments for an exchange-coupled paramagnet with uniaxial, single-ion anisotropy, i.e., H=− ∑ f1,f2I(f1,f2)Sf1·Sf2−D ∑ f (Sfz)2. We have used phenomenological procedures to construct the frequency and wave-vector-dependent Van Hove correlation function. The results are discussed with reference to the inelastic scattering cross section of slow neutrons from such paramagnetic systems.
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