Abstract:
We report a neutron scattering study of the instantaneous spin correlations in the two-dimensional spin S =5/2 square-lattice Heisenberg antiferromagnet Rb2MnF4. The measured correlation lengths are quantitatively described, with no adjustable parameters, by high-temperature series expansion results and by a theory based on the quantum self-consistent harmonic approximation. Conversely, we find that the data, which cover the range from about 1 to 50 lattice constants, are outside of the regime corresponding to renormalized classical behavior of the quantum non-linear model. In addition, we observe a crossover from Heisenberg to Ising critical behavior near the Néel temperature; this crossover is well described by a mean-field model with no adjustable parameters.
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Received: 3 March 1998 / Received in final form: 4 May 1998 / Accepted: 19 May 1998
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Lee, Y., Greven, M., Wells, B. et al. Spin correlations in the two-dimensional spin-5/2 Heisenberg antiferromagnet . Eur. Phys. J. B 5, 15–22 (1998). https://doi.org/10.1007/s100510050413
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DOI: https://doi.org/10.1007/s100510050413