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Spin-orbit coupled honeycomb magnets with the Kitaev interaction havereceived a lot of attention due to their potential of hosting exotic quantumstates including quantum spin liquids. Thus far, the most studied Kitaevsystems are 4d/5d-based honeycomb magnets. Recent theoretical studies predictedthat 3d-based honeycomb magnets, including Na2Co2TeO6 (NCTO), could also be apotential Kitaev system. Here, we have used a combination of heat capacity,magnetization, electron spin resonance measurements alongside inelastic neutronscattering (INS) to study NCTO's quantum magnetism, and we have found afield-induced spin disordered state in an applied magnetic field range of 7.5 T< B (vertical to b-axis) < 10.5 T. The INS spectra were also simulated totentatively extract the exchange interactions. As a 3d-magnet with afield-induced disordered state on an effective spin-1/2 honeycomb lattice, NCTOexpands the Kitaev model to 3d compounds, promoting further interests on thespin-orbital effect in quantum magnets.

Field-induced quantum spin disordered state in spin-1/2 honeycomb magnet Na2Co2TeO6