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Two quasi-1-dimensional S=1 quantum antiferromagnetic materials, PbNi2V2O8and SrNi2V2O8, are studied by inelastic neutron scattering on powder samples.While magnetic interactions in the two systems are found to be very similar,subtle differences in inter-chain interaction strengths and magnetic anisotropyare detected. The latter are shown to be responsible for qualitativelydifferent ground state properties: magnetic long-range order in SrNi2V2O8 anddisordered ``spin liquid'' Haldane-gap state in PbNi2V2O8.

Magnetic excitations in coupled Haldane spin chains near the quantum critical point