Substrate-tuned boson localization in superfluid (4)He films.
We have studied the influence of the substrate on superfluidity in thin 4He films. The inert coverage, the amount of nonsuperfluid 4He localized by the substrate, is found to scale with the well depth of the 4He-substrate interaction potential for six different substrates. Although the inert coverages for these substrates differ by more than a factor of 4, the phase boundary in the temperature-coverage plane is found to have a universal shape.
Csáthy
G A
GA
Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Reppy
J D
JD
Chan
M H W
MH