Publication Date:
2011-08-16
Description:
The resonant frequency of a quartz crystal oscillating in the thickness-shear mode changes by virtue of the mass loading due to any type of film laid down on its surfaces. For a helium film only the normal fraction remains rigidly coupled to the substrate motion. Adsorption isotherms of He-4 measured with this technique show clear departures from conventional nonsuperfluid behavior. We attribute this effect to the onset and presence of superfluidity in the film.
Keywords:
PHYSICS, SOLID-STATE
Type:
Physical Review Letters; 29; July 24
Format:
text
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