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Kosterlitz-Thouless transition for 4He films adsorbed to rough surfaces
1Laboratory of Low Temperature Physics, Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Physical Review Letters
|September 28, 2004
Abstract:
We report the study of adsorption isotherms of 4He on several well characterized rough CaF2 surfaces using a quartz crystal microbalance technique at 1.672 K. The signature of decoupled mass observed on crossing the Kosterlitz-Thouless transition as a function of 4He film thickness decreases and becomes increasingly difficult to identify as the surface roughness is increased. A peak in the dissipation, indicative of the onset of superfluidity, changes little with roughness.