Singlet Ground State and Magnetization Plateaus in Ba$_3$Mn$_2$O$_8$

Details Singlet Ground State and Magnetization Plateaus in Ba$_3$Mn$_2$O$_8$ Singlet Ground State and Magnetization Plateaus in Ba$_3$Mn$_2$O$_8$

2001-02-02

arxiv.org/abs/cond-mat/0102026v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, jpsj style

Scientific paper

10.1143/JPSJ.70.1790

Magnetic susceptibility and the magnetization process have been measured in \green polycrystal. In this compound, the magnetic manganese ion exists as Mn$^{5+}$ 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 $\Delta/k_{\rm B}=11.2$ 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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