The spin-wave spectrum of a one-dimensional Heisenberg antiferromagnet with no long-range order is derived by decoupling Green's-function equations in second order. Results are applied to static correlations, and agreement is obtained with Fisher's classical solution and quasielastic neutron-scattering data in (CD₃)₄NMnCl₃.
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Peter M. Richards (1971) studied this question.
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