Magnetic susceptibility and the magnetization process have been measured in \green polycrystal. In this compound, the magnetic manganese ion exists as Mn5+ in a tetrahedral environment, and thus the magnetic interaction can be described by an S=1 Heisenberg model. The ground state was found to be a spin singlet with an excitation gap Δ/kB=11.2 K. Magnetization plateaus were observed at zero and at half of the saturation magnetization. These results indicate that the present system can be represented by a coupled antiferromagnetic dimer model.
@article{arxiv.cond-mat/0102026,
title = {Singlet Ground State and Magnetization Plateaus in Ba$_3$Mn$_2$O$_8$},
author = {M. Uchida and H. Tanaka and M. Bartashevich and T. Goto},
journal= {arXiv preprint arXiv:cond-mat/0102026},
year = {2009}
}