Field Dependent Spin Dynamics of Antiferromagnetic Heisenberg Chains
The dynamic properties of simple magnetic chains, in which contiguous pairs of spins are exhange coupled, have been studied with a variety of techniques. These techniques include soliton theories in the presence of weak magnetic fields , perturbative studies of a generalized Langevin equation for intermediate and large fields [2, 3] and computer simulations . Here we calculate, using a new mode-coupling theory, the response function measured in neutron scattering experiments  and computer simulations . Special attention is given to the dynamics at the field induced cross-over from antiferromagnetic to ferromagnetic static correlations.
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