Critical Casimir effect near the (3)He-(4)He tricritical point.
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.
Garcia
R
R
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Chan
M H W
MH