Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-03-06
Physical Review B 71 134412 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
25 pages including 9 figures
Scientific paper
10.1103/PhysRevB.71.134412
The spin dynamics of coupled spin-1/2, antiferromagnetic Heisenberg chains is predicted to exhibit a novel longitudinal mode at low energies and temperatures below the Neel temperature. This mode is a dimensional crossover effect and reveals the presence of a limited amount of long-range antiferromagnetic order co-existing with quantum fluctuations. In this paper the existence of such a mode is confirmed in the model material KCuF3 using polarized and unpolarized inelastic neutron scattering and the longitudinal polarization of the mode is definitively established. The lineshape is broadened suggesting a reduced lifetime due to decay into spin-waves. In addition the data shows evidence of continuum scattering with a lower edge greater than the longitudinal mode energy. A detailed comparison is made with theoretical predictions and experimental work on other model materials.
Lake Bella
Nagler S. E.
Tennant D. A.
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