Splitting of the Néel transition in holmium in a magnetic field

Abstract
We report the first observation of a splitting of the Néel 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.