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Multiparticle continuum in the excitation spectrum of the compound CsNiCl

  • E. Ercolessi
  • G. Morandi
  • M. Roncaglia

Abstract:

Recent neutron scattering experiments on CsNiCl3 reveal some features that are not well described by the standard nonlinear σ model, nor by numerical simulations, for isolated S = 1 spin chains. In particular, in real systems at the antiferromagnetic point of the Brillouin zone, the intensity of the continuum of multiparticle excitations, at T = 6  K, is about 5 times greater than predicted. Also, the spin gap is higher and the correlation length is smaller than predicted. We propose a theoretical scenario where the interchain interaction is approximated by an effective staggered magnetic field, and that yields a correct prediction for the observed quantities.

PACS. 75.10.Jm Quantized spin models – 75.50.-y Studies of specific magnetic materials 

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Copyright information

© EDP Sciences, Springer-Verlag 2003

Authors and Affiliations

  • E. Ercolessi
    • 1
  • G. Morandi
    • 1
  • M. Roncaglia
    • 1
  1. 1.Physics Department, University of Bologna, INFM and INFN, 6/2 v.le B. Pichat, 40127, Bologna, ItalyIT

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