Abstract
A new type of the triangular lattice system,HxCoO2 (x≈0.3), is synthesized through chemical extraction of Na fromNa0.3CoO2 withH2SO4.The structure is modelled by two oxygen layers with a prismatic oxygen environment and a symmetriclinear H–O bond on the basis of x-ray powder diffraction and magic-angle spinning NMR analyses.Measurements of the electrical resistivity, thermoelectric power and magnetic susceptibilitysuggest a weakly correlated metallic state with the enhancement of effective mass.Transport anomalies, accompanied with the rapid decrease of thermoelectric power, areobserved at about 10 K.
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