Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 70, Issue 6, Pages 1790-1793Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.70.1790
Keywords
Ba3Mn2O8; Mn5+; S=1; quantum spin system; singlet ground state; excitation gap; magnetic susceptibility; high-field magnetization process; magnetization plateaus
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Magnetic susceptibility and the magnetization process have been measured in Ba3Mn2O8 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 gal. Delta /k(B) = 11.2K. 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 tic dimer model.
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