A multiple origin for non-linear transport properties in K_0.3MoO₃ molybdenum blue bronze

We report on non-linear transport properties in K_0.3MoO₃ molybdenum blue bronze. Wn show that the conductivity sharply increases above a characteristic threshold field E*_T in three perpendicular crystallographic directions. This threshold field is visible up to room temperature in the direction perpendicular to the (2̄01) plane. Data suggests that this singularity is probably not related to the motion of the Charge Density Wave (CDW). Along the CDW axis, the electric field dependence of the conductivity for W < E*_T can be very well described by the scaling theory of the CDW creep in the presence of randomly distributed pinning centers.