Abstract
The inadequacy of the standard coupled-mode theory of one dimensional paramagnets is resolved by renormalisation of the exchange coupling and time scale, in such a way that the refined theory is consistent with some static spin cumulants. With the proposed refinements the coupled-mode theory gives the exact spin dynamics in the limit of vanishing temperatures. For low temperatures the theory is studied numerically to achieve comparisons with computer simulation data that vindicate the renormalisation scheme.
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Lovesey, S.W., Megann, A. A coupled-mode theory of heisenberg paramagnets. Z. Physik B - Condensed Matter 63, 437–445 (1986). https://doi.org/10.1007/BF01726191
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DOI: https://doi.org/10.1007/BF01726191