Thermal Contraction and Disordering of the Al(110) Surface

Abstract

Al(110) has been studied for temperatures up to 900 K via ensemble density-functional molecular dynamics. The strong anharmonicity displayed by this surface results in a negative coefficient of thermal expansion, where the first interlayer distance decreases with increasing temperature. Very shallow channels of oscillation for the second-layer atoms in the direction perpendicular to the surface support this anomalous contraction, and provide a novel mechanism for the formation of adatom-vacancy pairs, preliminary to the disordering and premelting transition. Such characteristic behavior originates in the free-electron-gas bonding at a loosely packed surface.

4 pages, two-column style with 5 PostScript figures embedded. Uses RevTeX and epsf macros. To appear in Phys. Rev. Lett. Also available at http://www.physics.rutgers.edu/~marzari/preprints/index.html#al110

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