Recent theoretical studies have suggested that Kitaev physics and such
effects as formation of a mysterious spin-liquid state can be expected not only
in RuCl3 and iridates, but also in conventional 3d transition metal
compounds. Using DC and AC magnetometry, thermodynamic and 23Na nuclear
magnetic resonance measurements (NMR) we studied such a candidate material
Na3Co2SbO6 . A full phase diagram of Na3Co2SbO6 in a wide range of magnetic
fields and temperatures is presented. The results demonstrate transformation of
the magnetic structure realized at low-temperature and suppression of the AFM
order under the external field, the gradual development of the saturation
phase, as well as evidence of gapped spin-liquid-like behavior in certain parts
of the phase diagram