We present the results of magnetization and ac-susceptibility measurements on single-crystal erbium along all three crystal axes. We observe antiferromagnetic ordering of the c axis and the basal-plane-moment components at 89 and 53 K, respectively. In addition, we observe anomalies at 51, 40, 34, 29, and 27 K. These anomalies in magnetization and ac-susceptibility data correspond to the commensurate spin-slip structures observed by Gibbs et al. in x-ray synchrotron scattering studies. In addition, we find that the basal-plane ordering at T_N⊥=53 K takes place before any spin-slip transition appears as the temperature is lowered.
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Ali et al. (1990) studied this question.
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