Temperature dependence of the second threshold field for rubidium blue bronze Rb0.3MoO3

We have investigated the threshold properties of Rubidium blue bronze Rb0.3MoO3 under high dc electric field in a large temperature range 20–150 K. The second threshold fields have been observed at temperature up to 102.4 K, and have quasi-linear relationships with temperatures 20–45 K and 55–100 K, respectively. A novel crossover platform has been found firstly in the temperature dependence of the second threshold field E T 2 at about 45–55 K. The results indicate that the dynamical behavior of the second threshold effects may originate from different mechanisms. We suggest that the highly conducting state at 20–45 K and 55–100 K result from the undamped sliding motion of rigid CDW and current inhomogeneity, respectively.