title: Critical Casimir effect near the (3)He-(4)He tricritical point.
abstract: We present capacitance measurements of the equilibrium thickness of (3)He-(4)He mixture films as a function of temperature and concentration. The films are adsorbed on a Cu substrate situated above bulk liquid mixture. As we scan across the tricritical point, we observe a thickening of the film indicating the presence of a repulsive critical Casimir force.
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: R
authors.initials: R
authors.lastname: Garcia
authors.forename: M H W
authors.initials: MH
authors.lastname: Chan