Continuum in the spin excitation spectrum of a Haldane chain, observed by neutron scattering in CsNiCl3

Details Continuum in the spin excitation spectrum of a Haldane chain, observed by neutron scattering in CsNiCl3 Continuum in the spin excitation spectrum of a Haldane chain, observed by neutron scattering in CsNiCl3

2000-10-03

arxiv.org/abs/cond-mat/0010049v1

Phys. Rev. Lett. 87, 017202 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.87.017202

The spin excitation continuum, expected to dominate the low-energy fluctuation spectrum in the Haldane spin chain around the Brillouin zone center, q=0, is directly observed by inelastic magnetic neutron scattering in the S=1 quasi-1D antiferromagnet CsNiCl3. We find that the single mode approximation fails, and that a finite energy width appears in the dynamic correlation function S(q,omega) for q < 0.5pi. The width increases with decreasing q, while S(q,omega) acquires an asymmetric shape qualitatively similar to that predicted for the 2-magnon continuum in the nonlinear sigma-model.

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