Superfluidity Without Superflow in Unsaturated Helium Films

Third Sound and the Onset of Superfluidity in Unsaturated Helium Films

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Superflow in Solid Helium

The small mass and significant zero point motion of solid He make it very different from its conventional counterparts. In the seventies it was suggested that at very low temperatures solid helium might flow like a superfluid while remaining a crystal. This hidden “supersolid” phase was subsequently almost ruled out both by experiments and theoretical calculations. However, in 2004 Kim and Chan...

Observation of superflow in solid helium.

We report on the observation of nonclassical rotational inertia in solid helium-4 confined to an annular channel in a sample cell under torsional motion, demonstrating superfluid behavior. The effect shows up as a drop in the resonant oscillation period as the sample cell is cooled below 230 millikelvin. Measurement of 17 solid samples allows us to map out the boundary of this superfluid-like s...

Superfluidity in Solid Helium-4

Superfluidity in H2 Films

Path integral Monte Carlo calculations were used to study a 2D system of H2 molecules. The ground state on a flat substrate is a triangular lattice, a localized solid. We find that the introduction of some weakly attractive impurities (specifically alkali metal atoms) in the right concentration s,0.01 Å22d stabilizes a liquid hydrogen phase of concentration 0.04 Å22 which undergoes a Kosterlitz...