Doping Effects on the Charge-Density-Wave Dynamics in Blue Bronze

The temperature dependences of the dc resistivity and the nonlinear transport properties in pure, Rb-doped, and W-doped blue bronze K0.3MoO3 single crystals are presented. In comparison with the Rb doping, the W doping has larger effects on the electrical transport properties and the Peierls transition. In particular, the maximum in the temperature dependence of the threshold field for nonlinear transport, observed in pure and Rb-doped samples around 100 K, is absent in W-doped K0.3MoO3. These results are discussed with respect to the proposed incommensurate-commensurate transition of the chargedensity-wave and its interaction with impurities and normal carriers. PACS. 71.45.Lr Charge-density-wave systems – 71.30.+h Metal-insulator transition and other electronic