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We report a neutron scattering study of the spin correlations for the spin5/2, two-dimensional antiferromagnet Rb_2MnF_4 in an external magnetic field.Choosing fields near the system's bicritical point, we tune the effectiveanisotropy in the spin interaction to zero, constructing an ideal S=5/2Heisenberg system. The correlation length and structure factor amplitude areclosely described by the semiclassical theory of Cuccoli et al. over a broadtemperature range but show no indication of approaching the low-temperaturerenormalized classical regime of the quantum non-linear sigma model.Comment: 4 pages, 3 EPS figure

physical review letters

Spin Correlations in an Isotropic Spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>5</mml:mn><mml:mi>/</mml:mi><mml:mn>2</mml:mn></mml:math>Two-Dimensional Antiferromagnet

Spin Correlations in an Isotropic Spin-5/2Two-Dimensional Antiferromagnet