Continuum in the Excitation Spectrum of the S=1 Compound CsNiCl_3

Details Continuum in the Excitation Spectrum of the S=1 Compound CsNiCl_3 Continuum in the Excitation Spectrum of the S=1 Compound CsNiCl_3

2002-05-11

arxiv.org/abs/cond-mat/0205234v1

Eur. Phys. J. B 32, 489 (2003)

Physics

Condensed Matter

4 pages, 2 figures (.eps), RevTex

Scientific paper

10.1140/epjb/e2003-00129-0

Recent neutron scattering experiments on CsNiCl_3 reveal some features which are not well described by the nonlinear sigma model nor by numerical simulations on isolated S=1 spin chains. In particular, in real systems the intensity of the continuum of multiparticle excitations, at T=6K, is about 5 times greater than predicted. Also the gap is slightly higher and the correlation length is smaller. We propose a theoretical scenario where the interchain interaction is approximated by a staggered magnetic field, yielding to a correct prediction of the observed quantities.

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