We use polarized xyz neutron diffraction to examine the nature of the freezing transition to an unconventional topological spin-glass state in the Sϭ5/2 kagomé antiferromagnet (D 3 O)Fe 3 (SO 4 ) 2 (OD) 6 . Measurements of the total magnetic scattering cross-section, S(Q), were taken in the momentum-transfer range 0.5 рQр2.5 Å Ϫ1 between the temperatures 1.5 and 250 K. The observation of two-dimensional correlations at 250 K, i.e., in excess of 14 times the freezing temperature, is in agreement with predictions of an anisotropyinduced spin-glass freezing transition in an ordered kagomé antiferromagnet.
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