Anomalous layering at the liquid Sn surface

Details Anomalous layering at the liquid Sn surface Anomalous layering at the liquid Sn surface

2004-06-24

arxiv.org/abs/cond-mat/0406583v3

PHYSICAL REVIEW B 70, 224206 (2004)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 9 figures; to be submitted to Phys. Rev. B; updated references, expanded discussion

Scientific paper

10.1103/PhysRevB.70.224206

X-ray reflectivity measurements on the free surface of liquid Sn are presented. They exhibit the high-angle peak, indicative of surface-induced layering, also found for other pure liquid metals (Hg, Ga and In). However, a low-angle peak, not hitherto observed for any pure liquid metal, is also found, indicating the presence of a high-density surface layer. Fluorescence and resonant reflectivity measurements rule out the assignment of this layer to surface-segregation of impurities. The reflectivity is modelled well by a 10% contraction of the spacing between the first and second atomic surface layers, relative to that of subsequent layers. Possible reasons for this are discussed.

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