Journal
PHYSICAL REVIEW B
Volume 74, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.74.014510
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The propagation of pulsed third sound on a series of CaF2 substrates with varying roughness has been studied. The third sound speed is reported over a large range of He-4 film thickness including a detailed study near the onset of superfluidity. The shapes of the received third sound pulses are also reported over a large range of He-4 film thickness. Hysteresis is seen in the third sound speed on the roughest surfaces at low He-4 coverage, likely caused by capillary condensation of fluid on the surface structure. The hysteresis loops change with the roughness of the surface.
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