A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3
Journal Article
·
· Physical Review Letters
Inelastic neutron scattering measurements are reported that show a new longitudinal mode in the antiferromagnetically ordered phase of the spin-1/2 quasi-one-dimensional antiferromagnet KCuF{sub 3}. This mode signals the crossover from one-dimensional to three-dimensional behavior and indicates a reduction in the ordered spin moment of a spin-1/2 antiferromagnet. The measurements are compared with recent quantum field theory calculations and are found to be in excellent agreement. A feature of the data not predicted by theory is a damping of the mode by decay processes to the transverse spin-wave branches.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 820503
- Report Number(s):
- P99-105363; PRLTAO; TRN: US0602135
- Journal Information:
- Physical Review Letters, Vol. 85, Issue 4; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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