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We present in-plane optical measurements on Na x CoO 2 single crystals with x=0.5, 0.7 and 0.85. We found that the spectral weight associated with the conducting carriers increases with decreasing Na contents. Anomalous charge dynamics for samples in the metallic regime was revealed. For x=0.5 compound in the charge ordered state, the reflectance was strongly suppressed below 250cm...
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