KCuCl3 is an S = 1/2 magnetic insulator with a singlet ground
state and a finite spin excitation gap. Above the gap, dispersive
triplet excitation modes propagate in the whole reciprocal space.
From single-crystal inelastic neutron investigations the
three-dimensional coupling scheme is rationalized in the framework
of a dimer Heisenberg model, and related to the structural features
of KCuCl3. The experimental and theoretical
characterization presented completes earlier works on the compound under
investigation, providing also higher-order expressions for the
singlet-triplet dispersion relation. The latter may also be of
relevance for the parent quantum systems TlCuCl3 and
NH4CuCl3, albeit at different coupling ratios with respect
to KCuCl3.
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