Continuum in the Spin-Excitation Spectrum of a Haldane Chain Observed by Neutron Scattering in CsNiCl{sub 3}
Journal Article
·
· Physical Review Letters
The spin-excitation continuum, expected to dominate the low-energy fluctuation spectrum in the Haldane spin chain around the Brillouin zone center, q=0 , is directly observed by inelastic magnetic neutron scattering in the S=1 quasi-1D antiferromagnet CsNiCl{sub 3} . We find that the single mode approximation fails, and that a finite energy width appears in the dynamic correlation function S(q,{omega}) for q{approx_lt}0.5{pi} . The width increases with decreasing q , while S(q,{omega}) acquires an asymmetric shape qualitatively similar to that predicted for the two-magnon continuum in the nonlinear {sigma} -model.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204740
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 87; ISSN 0031-9007
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamics of Composite Haldane Spin Chains in IPA-CuCl3
Properties of Haldane Excitations and Multiparticle States in the Antiferromagnetic Spin-1 Chain Compound CsNiCl3
Multiparticle States in the S =1 Chain System CsNiCl{sub 3}
Journal Article
·
Sat Dec 31 23:00:00 EST 2005
· Physical Review Letters
·
OSTI ID:1003455
Properties of Haldane Excitations and Multiparticle States in the Antiferromagnetic Spin-1 Chain Compound CsNiCl3
Journal Article
·
Mon Dec 31 23:00:00 EST 2001
· Physical Review B
·
OSTI ID:1003492
Multiparticle States in the S =1 Chain System CsNiCl{sub 3}
Journal Article
·
Mon Jul 02 00:00:00 EDT 2001
· Physical Review Letters
·
OSTI ID:40204739