Order-Parameter Fluctuations and the Onset of Superfluidity in Thin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Films

Revzen, M.

doi:10.1103/physrevlett.22.1102

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1970

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Cited by 11 publications

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“…These numbers have been established through many other measurements on unsaturated helium films as discussed by Kagiwada 4 and Revzen. 6 The remaining two parameters, -Ppm anc * ^o> are established by the experimental conditions. From the two-parameter fit T 0 = 79°K which is close to T 0 = 87° as determined by Dash 11 for a monolayer of argon on copper.…”

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confidence: 99%

Third-Sound Resonance

Ratnam¹,

Mochel²

1970

Phys. Rev. Lett.

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We have obtained a thermodynamic state of thin helium films which permits precision measurements of their properties. Third-sound resonances indicate a cutoff for the propagation of third sound in these films. This cutoff is accompanied by an exponential rise in the dc thermal resistance of the helium film which indicates the formation of high-energy excitations of 0.08 eV. The dissipation at resonance is consistent with Bergman's theory for hydrodynamic dissipation of third sound.

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confidence: 99%