Infrared properties of W-doped charge-density-wave material K₀.₃MoO₃

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The optical conductivity spectra of quasi-one dimensional compounds K₀.₃Mo₁₋ₓWₓO₃ (x=0, 0.03 and 0.15) have been studied over broad frequencies. While the dc resistivity measurements indicate no sign of CDW transition in heavily W-doped blue bronze, the optical conductivity spectra still show a single particle gap at around 0.2 eV for E parallel to the chain direction. Such impurity effect challenges our understanding about the occurrence of the optical gap with the CDW transition.