Nonlinear Effects in the Dynamic Structure Factor of the Classical Antiferromagnetic Heisenberg Chain in an External Field at Low Temperatures

B. De Raedt, H. De Raedt, J. Fivez

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Is is found that nonlinear effects give rise to anomalies in the spectrum of the antiferromagnetic Heisenberg chain in an external field, even at low temperatures. Divergences in the two-magnon density of states are responsible for additional resonances, besides the usual spin-wave peak, in the dynamic structure factor.
Original languageEnglish
Number of pages3
JournalPhysical Review Letters
Issue number12
Publication statusPublished - 1981

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