Dynamics of coupled quantum spin chains

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 $\mathrm{KCu}{\mathrm{F}}_3$. The existence of a narrow longitudinal mode is predicted. The results are in agreement with general scaling arguments, contrary to spin wave theory.

12 pages, 1 figure, RevTeX 3.0, uuencoded file, some refs added

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