An experimental measurement of the staggered magnetization curve for a Haldane spin chain

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Long-range magnetic ordering in R₂ Ba Ni O₅ (R=magnetic rare earth) quasi-1-dimensional mixed-spin antiferromagnets is described by a simple mean-field model that is based on the intrinsic staggered magnetization function of isolated Haldane spin chains for the Ni-subsystem, and single-ion magnetization functions for the rare earth ions. The model is applied to new experimental results obtained in powder diffraction experiments on Nd₂ Ba Ni O₅ and Nd Y Ba Ni O₅, and to previously published diffraction data for Er₂ Ba Ni O₅. From this analysis we extract the bare staggered magnetization curve for Haldane spin chains in these compounds.