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1969•Physical Review LettersRequires access

Superflow in Helium Films: Third-Sound Measurements

R.S. Kagiwada, J. Fraser, I. Rudnick, David J. Bergman

Open publisher page 78 citations

Abstract

The results of measurements of third-sound velocity in adsorbed superfluid helium films (1.12-1.85\ifmmode^\circ\else\textdegree\fi{}K) are presented. It is found that the average superfluid fraction is nonvanishing at the superflow onset thickness and has a value about $\frac{3}{8}$ its bulk value. Possible reasons for a nonvanishing value are discussed. Healing lengths based on best fitting Ginzburg-Pitaevskii calculations are determined.

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What this paper is about

The results of measurements of third-sound velocity in adsorbed superfluid helium films (1.12-1.85\ifmmode^\circ\else\textdegree\fi{}K) are presented. It is found that the average superfluid fraction is nonvanishing at the superflow onset thickness and has a value about $\frac{3}{8}$ its bulk value. Possible reasons for a nonvanishing value are discussed. Healing lengths based on best fitting Ginzburg-Pitaevskii calculations are determined.

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Available abstract

The results of measurements of third-sound velocity in adsorbed superfluid helium films (1.12-1.85\ifmmode^\circ\else\textdegree\fi{}K) are presented. It is found that the average superfluid fraction is nonvanishing at the superflow onset thickness and has a value about $\frac{3}{8}$ its bulk value. Possible reasons for a nonvanishing value are discussed. Healing lengths based on best fitting Ginzburg-Pitaevskii calculations are determined.

Key concepts: Superfluidity, Second sound, Helium-4, Helium, Physics, Isotopes of helium, Superfluid helium-4, Helium-3

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