Dynamic correlations in a classical two-dimensional Heisenberg antiferromagnet

G. M. Wysin and A. R. Bishop
Phys. Rev. B 42, 810 – Published 1 July 1990
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Abstract

A Monte Carlo molecular-dynamics calculation of the dynamic structure function S(q,ω) for the classical two-dimensional isotropic Heisenberg antiferromagnet is presented. For wave vectors near the antiferromagnetic Bragg point, S(q,ω) is well described by a product of Lorentzians representing damped spin waves. For adequately low temperatures, the dependence of the spin-wave frequency and damping on wave vector and temperature are consistent with a dynamic scaling description of Chakravarty, Halperin, and Nelson. Even for higher temperatures a scaling description is quite well satisfied, but with a modified scaling frequency.

  • Received 1 February 1990

DOI:https://doi.org/10.1103/PhysRevB.42.810

©1990 American Physical Society

Authors & Affiliations

G. M. Wysin

  • Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506-2601

A. R. Bishop

  • Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545

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Vol. 42, Iss. 1 — 1 July 1990

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