Wetting Phase Transition at the Surface of Liquid Ga-Bi alloys: An X-ray Reflectivity Study

Details Wetting Phase Transition at the Surface of Liquid Ga-Bi alloys: An X-ray Reflectivity Study Wetting Phase Transition at the Surface of Liquid Ga-Bi alloys: An X-ray Reflectivity Study

2004-07-11

arxiv.org/abs/cond-mat/0407270v1

Physical Review Letters 84, 4385 (2000)

Physics

Condensed Matter

Statistical Mechanics

5 RevTex pages, 3 figures, Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.4385

X-ray reflectivity measurements of the binary liquid Ga-Bi alloy reveal a dramatically different surface structure above and below the monotectic temperature $T_{mono}=222^{\circ}$ C. A Gibbs-adsorbed Bi monolayer resides at the surface at both regimes. However, a 30 {\AA} thick, Bi-rich wetting film intrudes between the Bi monolayer and the Ga-rich bulk for $T > T_{mono}$. The internal structure of the wetting film is determined with {\AA} resolution, showing a theoretically unexpected concentration gradient and a highly diffuse interface with the bulk phase.

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