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We report on a member of the spin-disordered honeycomb latticeantiferromagnet in a quasi-one-dimensional cobaltate Ba_3Co_2O_6(CO_3)_0.7.Resistivity exhibits as semimetallic along the face-sharing CoO6 chains.Magnetic susceptibility shows strongly anisotropic Ising-spin character withthe easy axis along the chain due to significant spin-orbit coupling and atrigonal crystal field. Nevertheless, ^135Ba NMR detects no indication of thelong-range magnetic order down to 0.48 K. Marginally itinerant electronspossess large entropy and low-lying excitations with a Wilson ratio R_W = 116,which highlight interplays of charge, spin, and orbital in the disorderedground state.

Spin disorder in an Ising honeycomb chain cobaltate