Tetra point wetting at the free surface of liquid Ga-Bi.

@article{Huber2002TetraPW,
  title={Tetra point wetting at the free surface of liquid Ga-Bi.},
  author={P. Huber and O. Shpyrko and P. Pershan and B. Ocko and E. DiMasi and M. Deutsch},
  journal={Physical review letters},
  year={2002},
  volume={89 3},
  pages={
          035502
        }
}
A continuous surface wetting transition, pinned to a solid-liquid-liquid-vapor tetra coexistence point, is studied by x-ray reflectivity in liquid Ga-Bi binary alloys. The short-range surface potential is determined from the measured temperature evolution of the wetting film. The thermal fluctuations are shown to be insufficient to induce a noticeable breakdown of mean-field behavior, expected in short-range-interacting systems due to their d(u) = 3 upper critical dimensionality. 
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