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We report results of our study of a newly synthesized honeycomb iridateNaxIrO3 (0.60 < x < 0.80). Single-crystal NaxIrO3 adopts a honeycomb latticenoticeably without distortions and stacking disorder inherently existent in itssister compound Na2IrO3. The oxidation state of the Ir ion is a mixed valencestate resulting from a majority Ir5+(5d4) ion and a minority Ir6+(5d3) ion.NaxIrO3 is a Mott insulator likely with a predominant pseudospin = 1 state. Itexhibits an effective moment of 1.1 Bohr Magneton/Ir and a Curie-Weisstemperature of -19 K but with no discernable long-range order above 1 K. Thephysical behavior below 1 K features two prominent anomalies at Th = 0.9 K andTl = 0.12 K in both the heat capacity and AC magnetic susceptibility.Intermediate between Th and Tl lies a pronounced temperature linearity of theheat capacity with a large slope of 77 mJ/mole K2, a feature expected forhighly correlated metals but not at all for insulators. These results alongwith comparison drawn with the honeycomb lattices Na2IrO3 and (Na0.2Li0.8)2IrO3point to an exotic ground state in a proximity to a possible Kitaev spinliquid.

The ground state in a proximity to a possible Kitaev spin liquid: An undistorted honeycomb iridate NaxIrO3 (0.60 < x < 0.80)