Socoliuc A, Bennewitz R, Gnecco E, Meyer E
Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.
Phys Rev Lett. 2004 Apr 2;92(13):134301. doi: 10.1103/PhysRevLett.92.134301. Epub 2004 Apr 1.
A transition from stick-slip to continuous sliding is observed for atomically modulated friction by means of a friction force microscope. When the stick-slip instabilities cease to exist, a new regime of ultralow friction is encountered. The transition is described in the framework of the Tomlinson model using a parameter eta which relates the strength of the lateral atomic surface potential and the stiffness of the contact under study. Experimentally, this parameter can be tuned by varying the normal load on the contact. We compare our results to a recently discussed concept called superlubricity.
通过摩擦力显微镜观察到原子调制摩擦从粘滑转变为连续滑动。当粘滑不稳定性不再存在时，会遇到一种新的超低摩擦状态。利用参数η在汤姆林森模型的框架内描述这种转变，该参数将横向原子表面势的强度与所研究接触的刚度联系起来。在实验中，可以通过改变接触上的法向载荷来调整这个参数。我们将我们的结果与最近讨论的一个称为超润滑性的概念进行比较。
