Abstract
Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet ${\mathrm{Nd}}_{2}{\mathrm{BaNiO}}_{5}$. The longitudinal mode, polarized along the direction of ordered moments, is observed for the first time. The model of isolated Haldane chains in a static staggered exchange field, that is known to work very well for static properties and transverse spin excitations in ${R}_{2}{\mathrm{BaNiO}}_{5}$ compounds, fails to explain new results for the longitudinal spin gap.
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