Continuum spin excitations in S=1 one-dimensional antiferromagnet
arXiv:cond-mat/0109065 · doi:10.1063/1.1456440
Abstract
We present detailed measurement of the non-hydrodynamic part of the spin excitation spectrum in the model quasi-1D S=1 antiferromagnet CsNiCl3 by inelastic magnetic neutron scattering. In the better part of the Brillouin zone the effect of the inter-chain coupling is negligible, and spin dynamics reflects that of a single Haldane chain. We find that at q ~< 0.6pi this quantum spin system ceases to support coherent propagating excitation, which gradually turns into a continuum band of states, whose width grows with decreasing q. This finding is consistently verified under different resolution conditions, obtained with two different high-luminosity experimental setups.
Submitted to the Proceedings of the 46 Conference on Magnetism and Magnetic Materials, Seattle 2001. MMM-48729, abstract designation GC-07
References in corpus (4)
- Equal Time Correlations in Haldane Gap Antiferromagnets
- Continuum in the spin excitation spectrum of a Haldane chain, observed by neutron scattering in CsNiCl3
- Excitation Spectrum of Antiferromagnetic Chains
- S(k) for Haldane Gap Antiferromagnets: Large-scale Numerical Results vs. Field Theory and Experiment