Theoretical study of third sound in a layered superfluid film

E. Cheng; W. F. Saam; M. W. Cole; J. Treiner

doi:10.1007/BF00681870

Theoretical study of third sound in a layered superfluid film

E. Cheng, W. F. Saam, M. W. Cole, J. Treiner

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Abstract

We present a calculation of the third sound speed c₃ of thin⁴He films adsorbed on H₂, Li, Mg, graphite and H₂-plated graphite. The results show a clear correlation of oscillations in c₃, with a period of one atomic layer, with the layering phenomena observed in adsorption isotherms. Comparison is made with recent experimental results for helium films on solid H₂ by Shirron and Mochel and by Brisson, Mester and Silvera. The theoretical analysis suggests explanations for disagreements between different interpretations of data. A standard way of determining the number of so-called inert layers is questioned. Other available experimental data on graphite and H₂-plated graphite are also discussed.

Original language	English (US)
Pages (from-to)	11-24
Number of pages	14
Journal	Journal of Low Temperature Physics
Volume	92
Issue number	1-2
DOIs	https://doi.org/10.1007/BF00681870
State	Published - Jul 1993

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

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10.1007/BF00681870

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abstract = "We present a calculation of the third sound speed c3 of thin4He films adsorbed on H2, Li, Mg, graphite and H2-plated graphite. The results show a clear correlation of oscillations in c3, with a period of one atomic layer, with the layering phenomena observed in adsorption isotherms. Comparison is made with recent experimental results for helium films on solid H2 by Shirron and Mochel and by Brisson, Mester and Silvera. The theoretical analysis suggests explanations for disagreements between different interpretations of data. A standard way of determining the number of so-called inert layers is questioned. Other available experimental data on graphite and H2-plated graphite are also discussed.",

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AU - Cheng, E.

AU - Saam, W. F.

AU - Cole, M. W.

AU - Treiner, J.

PY - 1993/7

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N2 - We present a calculation of the third sound speed c3 of thin4He films adsorbed on H2, Li, Mg, graphite and H2-plated graphite. The results show a clear correlation of oscillations in c3, with a period of one atomic layer, with the layering phenomena observed in adsorption isotherms. Comparison is made with recent experimental results for helium films on solid H2 by Shirron and Mochel and by Brisson, Mester and Silvera. The theoretical analysis suggests explanations for disagreements between different interpretations of data. A standard way of determining the number of so-called inert layers is questioned. Other available experimental data on graphite and H2-plated graphite are also discussed.

AB - We present a calculation of the third sound speed c3 of thin4He films adsorbed on H2, Li, Mg, graphite and H2-plated graphite. The results show a clear correlation of oscillations in c3, with a period of one atomic layer, with the layering phenomena observed in adsorption isotherms. Comparison is made with recent experimental results for helium films on solid H2 by Shirron and Mochel and by Brisson, Mester and Silvera. The theoretical analysis suggests explanations for disagreements between different interpretations of data. A standard way of determining the number of so-called inert layers is questioned. Other available experimental data on graphite and H2-plated graphite are also discussed.

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Theoretical study of third sound in a layered superfluid film

Abstract

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