Coffey T, Krim J
Physics Department, North Carolina State University, Raleigh, 27695-8202, USA.
Phys Rev Lett. 2005 Aug 12;95(7):076101. doi: 10.1103/PhysRevLett.95.076101. Epub 2005 Aug 10.
We report a quartz crystal microbalance (QCM) study of sliding friction for solid xenon monolayers at 77 K on Cu(111), Ni(111), graphene/Ni(111), and C(60) substrates. Simulations have predicted a strong dependence of phononic friction coefficient (eta) on surface corrugation in systems with similar lattice spacing, eta approximately U(2)(0), but this has never before been shown experimentally. In order to make direct comparisons with theory, substrates with similar lattice spacing but varying amplitudes of surface corrugation were studied. QCM data reveal friction levels proportional to U(2)(0), validating current theoretical and numerical predictions. Measurements of Xe/C(60) are also included for comparison purposes.
我们报告了一项关于77K下固体氙单层在Cu(111)、Ni(111)、石墨烯/Ni(111)和C(60)衬底上滑动摩擦的石英晶体微天平（QCM）研究。模拟预测在具有相似晶格间距的系统中，声子摩擦系数（η）强烈依赖于表面起伏，η近似于U(2)(0)，但此前从未有过实验证明。为了与理论进行直接比较，研究了具有相似晶格间距但表面起伏幅度不同的衬底。QCM数据显示摩擦水平与U(2)(0)成正比，验证了当前的理论和数值预测。为作比较还包括了Xe/C(60)的测量结果。
