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

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

1998-01-08

arxiv.org/abs/cond-mat/9801068v2

Phys.Rev. Lett. 80, 3630 -3633 (1998).

Physics

Condensed Matter

Strongly Correlated Electrons

some revisions in text and figures 5 pages, 2 figures, PRL accepted for publication

Scientific paper

10.1103/PhysRevLett.80.3630

Long-range magnetic ordering in R_2 Ba Ni O_5 (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 Nd_2 Ba Ni O_5 and Nd Y Ba Ni O_5, and to previously published diffraction data for Er_2 Ba Ni O_5. From this analysis we extract the bare staggered magnetization curve for Haldane spin chains in these compounds.

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