Abstract
A torsional oscillator technique has been employed to investigate the onset of superfluidity in4He adsorbed on graphite fibers. A low temperature capacitance pressure gauge has been used to characterize the layered growth of the film as mass is added to the experimental cell. At T=0.84 K the onset of superfluidity occurs after completion of three layers. A comparison with similar data for a Mylar substrate shows that the dissipation peaks are much sharper for the graphite-fiber substrate.
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