Magnetic ground state of the frustrated honeycomb lattice antiferromagnet Bi 3 Mn 4 O 12 (NO 3 )

2012 
Bi${}_{3}$Mn${}_{4}$O${}_{12}$(NO${}_{3}$), in which the Mn${}^{4+}$ ions carry $S=3/2$, is the first honeycomb lattice system that shows no long-range magnetic ordering. We investigated the magnetic ground state of this compound by measuring magnetic susceptibility and \ensuremath{\mu}SR with a pure powder sample synthesized under an improved reaction condition. It was found that the system underwent a spin glass transition at 6 K in a zero magnetic field. A comparison of the temperature dependence of the magnetic susceptibility with the results of a Monte Carlo simulation suggests the importance of intra-bilayer coupling and further neighbor interactions beyond those of second neighbors.
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