Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-11-02
Phys. Rev. Lett 87, 017201 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
Latex, 3 figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.87.017201
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 Qc=pi, the continuum lies higher in energy than the Haldane gapped excitations. At 6K 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 non-linear sigma model for the 3-particle continuum.
Bennington Stephen M.
Buyers W. J. L.
Coldea Radu
Cowley R. A.
Enderle Mechthild
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