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As first predicted by Haldane, and later observed in neutron-scattering experiments, one-dimensional Heisenberg antiferromagnets of integer spin have an excitation gap. Recently, the highly one-dimensional antiferromagnet Ni(C₂{H}₈N₂{)}₂NO₂(ClO₄) has been studied in an applied magnetic field. We discuss the susceptibility, high-field magnetization, and field-dependent neutron scattering using general arguments and field-theory methods.
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Ian Affleck (1990) studied this question.
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