Weakly correlated triangular lattice metal HxCoO2 with x ≈ 0.3
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概要
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A new type of the triangular lattice system HxCoO2 (x ≈ 0.3)is synthesized through a chemical extraction of Na from Na0.3CoO2 withH2SO4. The structure is modelled by two oxygen layers with a prismaticoxygen environment and a symmetric linear H－O bond on the basis of the xraypowder diffraction and magic-angle spinning NMR analyses. Measurementsof the electrical resistivity, thermoelectric power and magnetic susceptibilitysuggest a weakly correlated metallic state with the enhancement of effective mass.The transport anomalies, accompanied with the rapid decrease of thermoelectricpower, are observed at about 10 K.
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