Gravity- and strain-induced electric fields outside metal surfaces

Details Gravity- and strain-induced electric fields outside metal surfaces Gravity- and strain-induced electric fields outside metal surfaces

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvb..4511249r&link_type=abstract

Physical Review B (Condensed Matter), Volume 45, Issue 19, May 15, 1992, pp.11249-11261

Physics

Condensed Matter

4

Surface Double Layers, Schottky Barriers, And Work Functions

Scientific paper

The gravity-induced electric field outside a metal object supported against gravity is predominantly due to its differential compression which arises in supporting its own weight. This Dessler-Michel-Rorschach-Trammell (DMRT) field, as it has come to be known, is expected to be proportional to the strain derivative of the work function of the surface. We report the results of an experiment designed to produce this effect with mechanically applied strain rather than with gravity. In essence, we have measured the strain-induced contact-potential variation between a metal surface of known strain gradient and an unstrained capacitive probe. We describe useful solutions to the problems faced in such an experiment, which were not adequately addressed by earlier workers. A knowledge of the DMRT field is of considerable importance to experiments designed to compare the gravitational acceleration of charged particles and antiparticles inside a metallic shield. Past experiments with electrons yielded results contrary to the then-expected DMRT field. We review and partially extend the theoretical background by drawing on later results based on the jellium model of metal surfaces. Our results for Cu and Au surfaces are consistent with jellium-based calculations which imply a DMRT field that is about an order of magnitude smaller and of opposite sign to the early estimates.

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