1996/04/25 by H. J. Schulz · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevlett.77.2790
published as Phys. Rev. Lett. 77, 2790 (1996) · 12 pages, 1 figure, RevTeX 3.0, uuencoded file, some refs added
arxiv created 1996/04/25 · arxiv updated 2009/11/30
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 \rm KCuF3. The existence of a narrow longitudinal mode is predicted. The results are in agreement with general scaling arguments, contrary to spin wave theory.