Singlet Ground State and Magnetization Plateaus in Ba3Mn2O8
M. Uchida, H. Tanaka, M. Bartashevich, T. Goto
Abstract
Magnetic susceptibility and the magnetization process have been measured in 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/k B=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.
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