Strain effects at solid surfaces near the melting point

Details Strain effects at solid surfaces near the melting point Strain effects at solid surfaces near the melting point

2002-09-27

arxiv.org/abs/cond-mat/0209636v1

Surf. Sci. 532-535 (2003) 623

Physics

Condensed Matter

Materials Science

Acceped for publication on Surface Science

Scientific paper

10.1016/S0039-6028(03)00470-9

We investigate the effects of strain on a crystal surface close to the bulk melting temperature T_m, where surface melting usually sets in. Strain lowers the bulk melting point, so that at a fixed temperature below but close to T_m the thickness of the quasi-liquid film is expected to grow with strain, irrespective of sign. In addition, a strain-induced solid surface free energy increase/decrease takes place, favoring/disfavoring surface melting depending on the sign of strain relative to surface stress. In the latter case one can produce a strain-induced prewetting transition, where for increasing temperature the liquid film suddenly jumps from zero to a finite thickness. This phenomenology is illustrated by a realistic molecular dynamics simulation of strained Al(110).

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