Multiparticle states in the S = 1 chain system CsNiCl3

M. Kenzelmann, R.A. Cowley, W.J.L. Buyers, R. Coldea, J.S. Gardner, M. Enderle, D.F. McMorrow, S.M. Bennington

    Research output: Contribution to journalJournal articleResearchpeer-review


    A continuum of magnetic states has been observed by neutron scattering from the spin-1 chain compound CsNiCl3 in its disordered gapped one-dimensional phase. Results using both triple-axis and time-of-flight spectrometers show that around the antiferromagnetic point Q(c) = pi, the continuum lies higher in energy than the Haldane gapped excitations. At 6 K the integrated intensity of the continuum is about 12(2)% of the total spectral weight. This result is considerably larger than the 1%-3% weight predicted by the nonlinear sigma model for the three-particle continuum.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number1
    Pages (from-to)017201.1-017201.4
    Publication statusPublished - 2001


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