Surface tension of helium II and the order parameter extrapolation length

Recent experimental results on the temperature dependence of the surface tension of liquid 4He near and below the γ-point are discussed. It is shown that these results can be used for determination of the extrapolation length l, entering the boundary condition ldΨ dz =Ψ for the superfluid order para...

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Bibliographic Details
Published in:Physics letters. A 1988-01, Vol.126 (5), p.356-358
Main Authors: Sobyanin, A.A., Stratonnikov, A.A.
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:Recent experimental results on the temperature dependence of the surface tension of liquid 4He near and below the γ-point are discussed. It is shown that these results can be used for determination of the extrapolation length l, entering the boundary condition ldΨ dz =Ψ for the superfluid order parameter Ψ= η exp( i∅) at the helium II surfaces. It is found from comparison with the experimental data that l=22±2 A ̊ in the case of the helium II-vapour interface, and l > 5 Å for the interface between liquid and solid helium.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(88)90850-X