Anomalous Spin Dynamics observed by High Frequency ESR in Honeycomb Lattice Antiferromagnet InCu2/3V1/3O3

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  • 7 December 2010
Abstract
High frequency ESR results on the S = 1/2 Heisenberg hexagonal antiferromagnet InCu2/3V1/3O3 are reported. This compound appears to be a rare model substance for the honeycomb lattice antiferromagnet with very weak interlayer couplings. The high temperature magnetic susceptibility can be interpreted by the S = 1/2 honeycomb lattice antiferromagnet and it shows the magnetic order like anomaly at TN = 38 K. Although, however, the resonance field of our high frequency ESR shows the typical behavior of the antiferromagnetic resonance, the linewidth of our high frequency ESR continues to broaden below TN, while it tends to decrease as lowering the temperature in the conventional three dimensional antiferromagnet. In general, a honeycomb lattice antiferromagnet is expected to show a simple antiferromagnetic order similar to a square lattice antiferromagnet theoretically because both are bipartite lattices. However, we suggest that the observed anomalous spin dynamics below TN is the peculiar feature of honeycomb lattice antiferromagnet which is not observed in square lattice antiferromagnet.

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