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High-frequency ESR results on the S=1/2 Heisenberg hexagonal antiferromagnetInCu2/3V1/3O3 are reported. This compound appears to be a rare model substancefor the honeycomb lattice antiferromagnet with very weak interlayer couplings.The high-temperature magnetic susceptibility can be interpreted by the S=1/2honeycomb lattice antiferromagnet, and it shows a magnetic-order-like anomalyat TN=38 K. Although, the resonance field of our high-frequency ESR shows thetypical behavior of the antiferromagnetic resonance, the linewidth of ourhigh-frequency ESR continues to increase below TN, while it tends to decreaseas the temperature in a conventional three-dimensional antiferromagnetdecreases. In general, a honeycomb lattice antiferromagnet is expected to showa simple antiferromagnetic order similar to that of a square latticeantiferromagnet theoretically because both antiferromagnets are bipartitelattices. However, we suggest that the observed anomalous spin dynamics belowTN is the peculiar feature of the honeycomb lattice antiferromagnet that is notobserved in the square lattice antiferromagnet.

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