Magnetic susceptibility, high-field magnetization, and inelastic neutron scattering experiments are used to study the magnetic properties of a new S0ex0ex=0ex0ex1 quasi-one-dimensional antiferromagnet PbNi₂V₂O₈. Interchain interactions are shown to be almost, but not quite, strong enough to destroy the nonmagnetic singlet ground state and the energy gap in the magnetic excitation spectrum. Substituting nonmagnetic Mg²⁺ ( S0ex0ex=0ex0ex0) ions for Ni²⁺ ( S0ex0ex=0ex0ex1) induces a magnetically ordered state at low temperatures. To our knowledge this is the first observation of doping-induced long-range order in a Haldane-gap system.
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Uchiyama et al. (1999) studied this question.
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