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High field electron spin resonance, nuclear magnetic resonance andmagnetization studies addressing the ground state of the quasi two-dimensionalspin-1/2 honeycomb lattice compound InCu{2/3}V{1/3}O{3} are reported.Uncorrelated finite size structural domains occurring in the honeycomb planesare expected to inhibit long range magnetic order. Surprisingly, ESR datareveal the development of two collinear antiferromagnetic (AFM) sublatticesbelow ~ 20 K whereas NMR results show the presence of the staggered internalfield. Magnetization data evidence a spin reorientation transition at ~ 5.7 T.Quantum Monte-Carlo calculations show that switching on the coupling betweenthe honeycomb spin planes in a finite size cluster yields a Neel-like AFM spinstructure with a substantial staggered magnetization at finite temperatures.This may explain the occurrence of a robust AFM state in InCu{2/3}V{1/3}O{3}despite an unfavorable effect of structural disorder.

Finite size effects and magnetic order in the spin-1/2 honeycomb lattice compound InCu{2/3}V{1/3}O{3}