A Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF3
B. Lake, D.A. Tennant, S.E. Nagler
TL;DR
This paper reports the discovery of a new longitudinal mode in KCuF3, revealing the crossover from 1D to 3D magnetic behavior and highlighting damping effects not predicted by existing theories.
Contribution
It presents experimental evidence of a novel longitudinal mode in KCuF3 and compares findings with quantum field theory, identifying unpredicted damping phenomena.
Findings
Observation of a new longitudinal mode in KCuF3
Excellent agreement with quantum field theory predictions
Detection of mode damping due to decay into transverse spin waves
Abstract
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 KCuF3. This mode signals the cross-over 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 results 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.
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