Two quasi-one-dimensional $S=1$ quantum antiferromagnetic materials, PbNi₂V₂O₈ and SrNi₂V₂O₈, are studied by inelastic neutron scattering on powder samples. A simple model Hamiltonian is proposed for the two systems and used to analyze the data. Quantitative information on in-chain and interchain interactions obtained from this analysis is discussed in the context of qualitatively different ground-state properties: magnetic long-range order in SrNi₂V₂O₈ and disordered ``spin liquid'' Haldane-gap state in PbNi₂V₂O₈.
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Zheludev et al. (2000) studied this question.
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