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We performed 23Na NMR measurements on a single-domain crystal of the Kitaevmaterial Na3Co2SbO6, with magnetic field applied along the crystalline a axis.A positive Curie-Weiss constant is obtained from the NMR Knight shift, whichsuggests the existence of ferromagnetic exchange couplings. Theantiferromagnetic ordering is found to be suppressed at a field of 1.9 T.Inside the ordered phase, our data reveal two additional phase transitions. At1.9 T, the spin-lattice relaxation rate 1/23T1 establishes a quantum criticalbehavior at high temperatures. However, at low temperatures, a gapped behavioris observed at the critical field, which suggests a weakly first-ordertransition instead and a possible field-induced quantum spin liquid. Ourresults reveal complex microscopic interactions in the system, which may helpto search for possible quantum spin liquids.

Field-induced phase transitions and quantum criticality in a honeycomb antiferromagnet Na3Co2SbO6