Abstract
Dynamic spin correlations in the spin-flop phase of a Heisenberg antiferromagnet are studied in terms of the quantities that determine the inelastic scattering of neutrons from single spin-wave states. A complete expression for the cross-section is given using linear spin-wave theory. The non-linear features of the spin dynamics which are intrinsic to the spin-flop state are studied by perturbation theory. Two limiting cases are considered, and these correspond to states where the spins are close to an antiferromagnetic configuration (weak field limit) and the almost completely field aligned configuration. Analytic expressions are given for the appropriate collisional self-energies, in the limit of low temperatures, for selected wavevectors in one and three dimensional systems.
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