Persistent currents in saturated superfluid4He films on rough surfaces in the presence of third-sound resonances

Galkiewicz, R. K.; Telschow, K. L.; Hallock, R. B.

doi:10.1007/bf00654565

Cited by 19 publications

(1 citation statement)

References 25 publications

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“…1, which suggests a rough surface. 16 This cross section was used to estimate the flow velocities given above. A separate run has also been made after the flow-detector slot was plugged with epoxy; over a 24-h period no flow was observed which eliminated the possibility of a leak at the bottom of the flow detector.…”

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confidence: 99%

He3Film Flow: Two-Dimensional Superfluidity

et al. 1985

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3 He film flow has been observed. The maximum flow rate, at 0.7 mK, over a rim 0.9 mm above the 3 He level, was 1.2 mm 3 /h corresponding to an approximate flow velocity of 0.2 mm/sec. A flow rate of 0.2 mm 3 /h ( ~ 0.1 mm/sec) was measured with the rim 14 mm above the level. The transition to superflow occurred at 3.5 ± 0.5 mK for the 0.9-mm film and 2.0 ± 0.5 mK for the 14mm film. This flow is in a regime where the film thickness is less than or comparable to the bulk superfluid 3 He coherence length ( ~ 1000 A at 0.8 mK) and the temperature is higher than the bulk 3 He superfluid transition temperature (1.08 mK) and corresponds, we believe, to a twodimensional superfluid phase of 3 He. PACS numbers: 67.50.-b, 67.70. + nThe superfluid phases of liquid 3 He, discovered a decade ago, have proven a very rich field of physics. 1 Whereas the range of phenomena has been far more extensive than for superfluid liquid 4 He, film flow is one property which was expected to be unique to 4 He. 2 The reason for not expecting film flow in 3 He was that the coherence length is larger than the equilibrium thickness of the 3 He film on a vertical wall at a height of 100 /itm or more above the meniscus of the free surface. This is demonstrated in Fig. 1 which compares film thickness (d), which varies with height (/z), with the coherence length (f), in bulk 3 He at 0, 0.5, and 0.8 mK. The figure is schematic only; the coherence lengths are from BCS theory, 4 and the literature contains many warnings concerning estimates of helif\ 1 \ f \

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confidence: 99%

He3Film Flow: Two-Dimensional Superfluidity

et al. 1985

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The Decay of Persistent Currents in Unsaturated Superfluid 4He Films

Telschow

Ekholm

Hallock

1977

Quantum Fluids and Solids

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Thickness measurements of unsaturated superfluid 4He films under driven and persistent flow

Ekholm

Hallock

1981

J Low Temp Phys

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Third-sound techniques have been used to measure the thickness of an unsaturated superfluid 4He film as a function of flow velocity. Under the conditions of persistent flow the film thins according to the predictions of Kontorovich. In situations in which a heater is used to continuously drive a film current the measured thinning is in disagreement with the predictions of Kontorovich. A possible explanation for these results is presented. We conclude that the film thinning problem presents no fundamental discrepancy with the Bernoulli equation.

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Persistent currents in saturated superfluid4He films on rough surfaces in the presence of third-sound resonances

Cited by 19 publications

References 25 publications

He3Film Flow: Two-Dimensional Superfluidity

He3Film Flow: Two-Dimensional Superfluidity

The Decay of Persistent Currents in Unsaturated Superfluid 4He Films

Thickness measurements of unsaturated superfluid 4He films under driven and persistent flow

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