Abstract
The temperature dependence of the magnetic critical scattering above TN and the staggered magnetization below TN has been measured in the longitudinally modulated antiferromagnets thulium and erbium using neutron diffraction. The transitions which occur at TN=57.65+or-0.10 K in thulium and at TN=86.04+or-0.20 K the erbium appear to be continuous second-order transitions. As longitudinally modulated antiferromagnets thulium and erbium would be expected to belong to the d=3, n=2 unversality class of the d=3 XY model.
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