Low-Temperature Electronic Transport Property Of Quasi-One-Dimensional Charge-Density-Wave Conductor Rb_0.3MoO₃

The study on quasi-one-dimensional charge-density-wave (CDW) conductors has ever been one of the most fascinating fields of condensed matter physics, especially of the low dimensional condensed matter physics. In the quasi-one-dimensional conductors, the strong anisotropy of the electronic structure and special topology structure of the Fermi surface will induce the Peierls instability and form the charge density waves (CDW) below a characteristic temperature. Due to the formation of CDW, a lot of novel physical phenomena present, such as nonlinear transport property, noise, switching, hysteresis, and so on.Although enormous progress has been made on both the experiments and theories in the past twenty years, up to now, some basic problems are still unclear. Some transport properties, for example, nonlinear V-I characteristics, switching, remain farther investigations. In addition, the researches of the non equilibrium dynamic properties of CDW conductors have become one of the most hotpot of low dimensional condensed matter physics.In this thesis, we discussed the mechanism of Peierls phase transition through experimental research of rubidium blue bronze and its W-dopped samples. Moreover, we investigated the second threshold property in a comparative large temperature range and the modulation effect of transverse current.Firstly, with the electrolytic reduction method, we successfully prepared the single crystals of molybdenum blue bronze Rb_0.3MoO₃ and the W-dopped bronze with the raw material of Rb₂CO₃, MoO₃ and WO₃. The crystal structure of a series of Rb_0.3Mo_1-xW_xO₃ single crystal and the influence of W-dopping blue bronze on Pereils trasition are identified. We find that the present of tungsten decreases Peierls transition temperature T_p and weakens the intensity of transition until it disappeares finally.Secondly, we studied the switching effect under high applied field of pure Rb_0.3MoO₃ in a large temperature range (20-11 OK). The switching phenomenon accompanied with the second threshold field E_t2 was firstly observed even up to 100K, and the temperaturedependence of Et2 was presented for the first time. We find that Ej2 does hardly vary wil temperature from 40K to 60K. Basing on these discoveries, we discussed the formatio mechnism of the second threshold field in blue bronze.Thirdly, modulation effect of transverse current on the CDW in RbojMoCb was studiec In voltage-driving condition along longitudinal direction, we observed the abnorma modulation of transverse current on the first threshold field En, which is completely differen with the observations in current-driving condition. In addition, transverse current has eviden modulation on the switching pheomenon under high electric field along the longitudina direction, the second threshold field decreases with the increase of transverse current when i exceeds a critical value both in current-driving and voltage-driving conditions.