We report the first observation of a splitting of the N\'eel transition in holmium in an applied magnetic field. Such a splitting was predicted by Schaub and Mukamel for rare-earth metals with n=4 order parameters in a field normal to the spiral axis, so this observation may indicate the occurrence of the linearly polarized spin-density-wave phase which they suggested.
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Steinitz et al. (1987) studied this question.
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