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首页> 外文期刊>Physical Review, B. Condensed Matter >Connective neck evolution and conductance steps in hot point contacts - art. no. 045413
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Connective neck evolution and conductance steps in hot point contacts - art. no. 045413

机译：热点接触中的结缔颈演变和电导步骤-艺术。没有。 045413

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Dynamic evolution of the connective neck in Al and Pb mechanically controllable break junctions was studied during continuous approach of electrodes at bias voltages V-b up to a few hundred millivolt. A high level of power dissipation (10(-4)-10(-3) W) and high current density (j greater than or similar to 10(10) A/cm(2)) in the constriction lead to overheating of the contact area, electromigration, and current-enhanced diffusion of atoms out of the "hot spot." At a low electrode approach rate (similar to10-50 pm/s) the transverse dimension of the neck and the conductance of the junction depend on V-b and remain nearly constant over the approach distance of 10-30 nm. For V-b > 300 mV the connective neck consists of a few atoms only and the quantum nature of conductance manifests itself in abrupt steps and reversible jumps between two or more levels. These features are related to an ever changing number of individual conductance channels due to the continuous rearrangement in atomic configuration of the neck, the recurring motion of atoms between metastable states, the formation and breaking of isolated one-atom contacts, and the switching between energetically preferable neck geometries. [References: 35]
机译：研究了在Al和Pb的机械可控断开连接处的连接颈的动态演变过程，该过程是在电极连续接近电压为数百毫伏的V-b时进行的。收缩处的高功率耗散（10（-4）-10（-3）W）和高电流密度（j大于或类似于10（10）A / cm（2））导致电子管过热接触面积，电迁移和电流增强后的原子从“热点”扩散出去。在低电极接近速度（类似于10-50 pm / s）下，颈部的横向尺寸和结的电导率取决于V-b，并且在10-30 nm的接近距离上几乎保持恒定。当V-b> 300 mV时，连接颈仅由几个原子组成，并且电导的量子性质以突然的阶跃和两个或多个能级之间的可逆跃迁表现出来。这些特征与以下因素有关：单个电导通道的数量不断变化，这归因于颈部原子构型的连续重排，亚稳态之间原子的重复运动，孤立的单原子接触的形成和破坏以及能量之间的切换优选的颈部几何形状。 [参考：35]

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