Physics – Condensed Matter – Materials Science
Scientific paper
2000-08-03
Physics
Condensed Matter
Materials Science
29 pages, plain tex with special macros provided
Scientific paper
Using both a recent calculation by Bruch of the damping of the motion of a monolayer nitrogen film oscillating harmonically on a metallic surface due to Ohm's law heating and a Thomas-Fermi approximation treatment of the Ohm's law heating mechanism, which accounts for the nonzero thickness of the surface region of a metal, it is argued that this mechanism for friction is able to account for recent measurements of the drop in the friction for anitrogen film sliding over a lead substrate as it goes below its superconducting transition temperature. Bruch's calculation is also made more transparent by re-doing the calculation for a film sliding at constant speed, instead of oscillating. Using this treatment, it is easily shown that Bruch's calculation is equivalent to integrating Boyer's solution of the problem of a charge sliding over a metallic surface over the charge density of the monolayer nitrogen film.
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