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

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Abstract

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 Qc = π, the continuum lies higher in energy than the Haldane gapped excitations. At 6K 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
Volume87
Issue number1
DOIs
StatePublished - 2001
Externally publishedYes

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