Magnetism and charge ordering in Fe3O2BO3 ludwigite

Abstract Features of the magnetic and charge ordering of the Fe3O2BO3 ludwigite have been studied using Mossbauer spectroscopy in the range of 4 K T K . From the temperature dependence of the magnetic hyperfine fields (Bhf), associated to four different iron sites, three magnetic transitions, at 112, 73 and 40 K, can be distinguished in agreement with previous magnetization measurements. In the temperature region where a weak ferromagnetism appears, the Bhf of some Fe sites show two different values related with different canting angles.