We report on diverse transport properties observed in NbSe₃ nanowires of dilute Ni concentrations, where the resistance of some nanowires retains metallic behavior with regions of negative absolute resistance and switching transition showing up in current-voltage curve at sufficiently low temperatures, while others demonstrate metal-insulator transitions below the first charge density wave (CDW) transition. The temperature and voltage dependence of the resistance for the nonmetallic samples are governed by power laws; however, the anomalous features of the CDW transitions still retain. The observed transport behaviors are apparently due to the variation of potential along the conducting channel caused by different kinds of nonuniformities. A phenomenological model with one-dimensional phase slippage occurring in the certain segment of the nanowire, where Friedel oscillations-enhanced local CDW domains cluster altogether over the whole cross section, is presented as the possible mechanism for the nonmetallic power-law behavior. Our work sheds new light on the possible origin of nonmetallic power-law behavior in NbSe₃, which has been under debate for a long time.

我们报告了在 NbSe _{3中观察到的不同传输特性}稀Ni浓度的纳米线，其中一些纳米线的电阻保持金属行为，在足够低的温度下电流-电压曲线中显示出负绝对电阻和开关转变区域，而其他纳米线在第一电荷密度波以下表现出金属-绝缘体转变（ CDW) 过渡。非金属样品电阻的温度和电压依赖性受幂律控制；然而，CDW 跃迁的异常特征仍然保留。观察到的传输行为显然是由于不同类型的不均匀性引起的沿导电通道的电位变化。在纳米线的某一段发生一维相位滑移的现象学模型，其中弗里德尔振荡增强的局部 CDW 域在整个横截面上完全聚集，被认为是非金属幂律行为的可能机制。我们的工作揭示了 NbSe 中非金属幂律行为的可能起源₃，这个问题争论了很久。