Abstract
In order to clarify the nature of the additional phase transition at H 1 (T) < H c (T) of the layered antiferromagnetic (AF) insulator FeBr 2 as found by Aruga Katori et al. (1996) we measured the intensity of different Bragg-peaks in different scattering geometries. Transverse AF ordering is observed in both AF phases, AF I and AF II. Its order parameter exhibits a peak at T 1 = T (H 1 ) in temperature scans and does not vanish in zero field. Possible origins of the step-like increase of the transverse ferromagnetic ordering induced by a weak in-plane field component when entering AF I below T1 are discussed.
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