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Critical dynamics of a spin-5/2 two-dimensional isotropic antiferromagnet
  • Rebecca J. Christianson, Olin College of Engineering
  • R. L. Leheny, John Hopkins University
  • R. J. Birgeneau, University of Toronto
  • R. W. Erwin, National Institute of Standards and Industry
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We report a neutron-scattering study of the dynamic spin correlations in Rb2MnF4, a two-dimensional spin-5/2 antiferromagnet. By tuning an external magnetic field to the value for the spin-flop line, we reduce the effective spin anisotropy to essentially zero, thereby obtaining a nearly ideal two-dimensional isotropic antiferromagnet. From the shape of the quasielastic peak as a function of temperature, we demonstrate dynamic scaling for this system and find a value for the dynamical exponent z. We compare these results to theoretical predictions for the dynamic behavior of the two-dimensional Heisenberg model, in which deviations from z=1 provide a measure of the corrections to scaling.

© (2001) American Physical Society. The article appeared in Physical Review B, Vol 63, and may be found at

Citation Information
Rebecca J. Christianson, R. L. Leheny, R. J. Birgeneau and R. W. Erwin. "Critical dynamics of a spin-5/2 two-dimensional isotropic antiferromagnet" (2001)
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