title: Tetra point wetting at the free surface of liquid Ga-Bi.
abstract: 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.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: P
authors.initials: P
authors.lastname: Huber
authors.forename: O G
authors.initials: OG
authors.lastname: Shpyrko
authors.forename: P S
authors.initials: PS
authors.lastname: Pershan
authors.forename: B M
authors.initials: BM
authors.lastname: Ocko
authors.forename: E
authors.initials: E
authors.lastname: DiMasi
authors.forename: M
authors.initials: M
authors.lastname: Deutsch