Spin-Vacancy-Induced Long-Range Order in a New Haldane-Gap Antiferromagnet

Abstract

Magnetic susceptibility, high-field magnetization and inelastic neutron scattering experiments are used to study the magnetic properties of a new S=1 quasi-1-dimensional antiferromagnet PbNi2V2O8. Inter-chain 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 Mg${}^{2+}$ (S=0) ions for Ni${}^{2+}$ (S=1) 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.

5 pages including 4 figures

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