Pressure of thermal excitations in superfluid helium

We find the pressure, due to the thermal excitations of superfluid helium, at the interface with a solid. The separate contributions of phonons, R- rotons and R+ rotons are derived. The pressure due to R- rotons is shown to be negative and partially compensates the positive contribution of R+ rotons...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2008-06, Vol.20 (24), p.245103-245103 (6)
Main Authors: Adamenko, I N, Nemchenko, K E, Tanatarov, I V, Wyatt, A F G
Format: Article
Language:English
Subjects:
Boson degeneracy and superfluidity of 4he
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Physics
Quantum fluids and solids
liquid and solid helium
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Summary:We find the pressure, due to the thermal excitations of superfluid helium, at the interface with a solid. The separate contributions of phonons, R- rotons and R+ rotons are derived. The pressure due to R- rotons is shown to be negative and partially compensates the positive contribution of R+ rotons, so the total roton pressure is positive but several times less than the separate R- and R+ roton contributions. The pressure of the quasiparticle gas is shown to account for the fountain effect in He II. An experiment is proposed to observe the negative pressure due to R- rotons.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/20/24/245103