Measurements of the dead layer in superfluid 4He films on H3 and C60

P. W. Adams, Louisiana State University
V. Pant, Louisiana State University
A. F. Hebard, Nokia Bell Labs


We have measured the 2D 4He superfluid density, σs, on hydrogen and C60 using a high-Q Al oscillator, operated in an open geometry. We find that only 1 2 layer of helium remains normal well below the transition on hydrogen as opposed to 4 layers on the surface of bare C60. © 1994.