Dynamics of coupled quantum spin chains
H. J. Schulz
Abstract
Static and dynamical properties of weakly coupled antiferromagnetic spin chains are treated using a mean--field approximation for the interchain coupling and exact results for the resulting effective one--dimensional problem. Results for staggered magnetization, Néel temperature and spin wave excitations are in agreement with experiments on KCuF3. The existence of a narrow longitudinal mode is predicted. The results are in agreement with general scaling arguments, contrary to spin wave theory.
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