抄録
The electron localization in 1T-TaS2 is studied by means of the analysis of the non-Ohmic conduction which is observable below liquid N2 temperature. By correlating the electric field dependences of the conductivity, Hall coefficient and magnetoresistance with their temperature dependences it is found that an electric field has the effect of raising an electron temperature (hot-electron effect). The non-Ohmic conduction due to the electron heating mechanism is highly suggestive for the existence of the weakly localized states. The inelastic scattering length which determines the rise of the electron temperature is estimated. It shows the temperature dependence proportional to T−1⁄2 above 15 K, whereas it is almost T-independent below 15 K. This may possibly be interpreted as a gradual change of the mechanism of the non-Ohmic conduction associated with a crossover towards stronger localization as the temperature is lowered.
