The magnetic properties of GdBaMn_{2}O_{5.0}, which exhibits charge ordering, are studied from 2 to 400 K using single crystals. In a small magnetic field applied along the easy axis, the magnetization M shows a temperature-induced reversal which is sometimes found in ferrimagnets. In a large magnetic field, on the other hand, a sharp change in the slope of M(T) coming from an unusual turnabout of the magnetization of the Mn sublattices is observed. Those observations are essentially explained by a molecular field theory which highlights the role of delicate magnetic interactions between Gd^{3+} ions and the antiferromagnetically coupled Mn^{2+}/Mn^{3+} sublattices.
@article{arxiv.0706.0749,
title = {Peculiar Ferrimagnetism Associated with Charge Order in Layered Perovskite GdBaMn2O5},
author = {A. A. Taskin and Yoichi Ando},
journal= {arXiv preprint arXiv:0706.0749},
year = {2009}
}