Anomalous Spin Dynamics Observed by High Frequency ESR in Honeycomb Lattice Antiferromagnet In Cu2/3V1/3O3
S. Okubo, H. Wada, H. Ohta, T. Tomita, M. Fujisawa, T. Sakurai, E. Ohmichi and H. Kikuchi
J. Phys. Soc. Jpn. 80(2) (2011) 023705/1-4.  (2011 Feb. published)