Institute of Physics, HR-10001 Zagreb, POB 304, Croatia.
J Phys Condens Matter. 2010 Feb 10;22(5):055603. doi: 10.1088/0953-8984/22/5/055603. Epub 2010 Jan 19.
We have studied the dependence of the low electric field conductivity of the charge density wave (CDW) system o-TaS(3) on the temperature and applied electric field history. Without the application of high electric fields, the conductivity is higher on cooling than on heating in a wide temperature range below the CDW transition. With the application of increasing field at a given temperature the conductivity evolves towards a stable, history-independent value situated between the cooling and heating values. The evolution is gradual but most pronounced around the threshold field for nonlinear conductivity. The relative change of conductivity after the application of high field is asymmetric in respect of the temperature history. We discuss the results within the model of quantized changes of the CDW wavelength induced by the variation of the temperature and the electric field.
我们研究了 o-TaS(3) 电荷密度波 (CDW) 系统的低温电场电导率对温度和外加电场历史的依赖性。在不施加高电场的情况下，在 CDW 转变温度以下的很宽温度范围内，冷却时的电导率高于加热时的电导率。在给定温度下施加逐渐增加的电场时，电导率朝着稳定的、与历史无关的值演变，该值位于冷却和加热值之间。这种演变是渐进的，但在非线性电导率的阈值场附近最为明显。施加高电场后电导率的相对变化在温度历史方面是不对称的。我们在由温度和电场变化引起的 CDW 波长量子化变化的模型内讨论了这些结果。
