Abstract
A continuum of magnetic states has been observed by neutron scattering from the spin-1 chain compound in its disordered gapped one-dimensional phase. Results using both triple-axis and time-of-flight spectrometers show that around the antiferromagnetic point , the continuum lies higher in energy than the Haldane gapped excitations. At the integrated intensity of the continuum is about of the total spectral weight. This result is considerably larger than the weight predicted by the nonlinear sigma model for the three-particle continuum.
- Received 2 June 2000
DOI:https://doi.org/10.1103/PhysRevLett.87.017201
©2001 American Physical Society