Dynamics of coupled quantum spin chains

Details Dynamics of coupled quantum spin chains Dynamics of coupled quantum spin chains

1996-04-23

arxiv.org/abs/cond-mat/9604144v2

Phys. Rev. Lett. 77, 2790 (1996)

Physics

Condensed Matter

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

Scientific paper

10.1103/PhysRevLett.77.2790

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, N\'eel temperature and spin wave excitations are in agreement with experiments on $\rm KCuF_3$. 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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