A multiple origin for non-linear transport properties in K0.3MoO3 molybdenum blue bronze

We report on non-linear transport properties in K0.3MoO3 molybdenum blue br onze. We show that the conductivity sharply increases above a characteristi c threshold field E-T* in three perpendicular crystallographic directions. This threshold field is visible up to room temperature in the direction per pendicular to the ((2) over bar 01) plane. Data suggests that this singular ity 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 E < E-T* can be very well described by the scaling theory of the CDW creep in the presence of randomly distributed pinning centers.