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Multiparticle states in the S = 1 chain system CsNiCl3
M Kenzelmann1, R A Cowley, W J Buyers
1Oxford Physics, Clarendon Laboratory, Oxford OX1 3PU, United Kingdom.
Physical Review Letters
|July 20, 2001
Summary
Neutron scattering reveals a continuum of magnetic states in the spin-1 chain compound CsNiCl3, existing above the Haldane gapped excitations. This observed continuum exhibits significantly higher spectral weight than theoretical predictions.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Magnetism
Background:
- Spin-1 chain compounds like CsNiCl3 exhibit complex magnetic behaviors.
- Understanding the disordered gapped phase is crucial for characterizing low-dimensional magnetism.
Purpose of the Study:
- To investigate the magnetic states in the disordered gapped phase of CsNiCl3 using neutron scattering.
- To compare experimental observations with theoretical predictions, specifically the nonlinear sigma model.
Main Methods:
- Utilized neutron scattering techniques, including triple-axis and time-of-flight spectrometers.
- Analyzed magnetic excitations and spectral weight at a temperature of 6 K.
Main Results:
- Observed a continuum of magnetic states in CsNiCl3 above the Haldane gapped excitations.
- The integrated intensity of this continuum was measured to be approximately 12(2)% of the total spectral weight.
- This experimental value is substantially larger than the 1%-3% predicted by the nonlinear sigma model for a three-particle continuum.
Conclusions:
- The experimental findings challenge the predictions of the nonlinear sigma model for the observed magnetic continuum.
- Suggests the need for refined theoretical models to fully describe the magnetic excitations in CsNiCl3.
- Highlights the complex nature of magnetic states in one-dimensional spin systems.