Multiparticle states in the S=1 chain system CsNiCl3 -: art. no. 017201

被引：36
|
作者：
Kenzelmann, M [1 ]
Cowley, RA
Buyers, WJL
Coldea, R
Gardner, JS
Enderle, M
McMorrow, DF
Bennington, SM
机构：
[1] Oxford Phys, Clarendon Lab, Oxford OX1 3PU, England
[2] Natl Res Council Canada, Neutron Program Mat Res, Chalk River, ON K0J 1J0, Canada
[3] Canadian Inst Adv Res, Toronto, ON, Canada
[4] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA
[5] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[6] Univ Saarlandes, D-66123 Saarbrucken, Germany
[7] Riso Natl Lab, Dept Condensed Matter Phys & Chem, DK-4000 Roskilde, Denmark
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 01期
关键词：
D O I：
10.1103/PhysRevLett.87.017201
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A continuum of magnetic states has been observed by neutron scattering from the spin-1 chain compound CsNiCl3 in its disordered gapped one-dimensional phase. Results using both triple-axis and time-of-flight spectrometers show that around the antiferromagnetic point Q(c) = pi, the continuum lies higher in energy than the Haldane gapped excitations. At 6 K the integrated intensity of the continuum is about 12(2)% of the total spectral weight. This result is considerably larger than the 1%-3% weight predicted by the nonlinear sigma model for the three-particle continuum.
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页数：4
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