Wetting properties of liquid helium on rubidium metal

Demolder, B.; Bigelow, N. P.; Nacher, Pierre-Jean; Dupont‐Roc, J.

doi:10.1007/bf00754070

Cited by 43 publications

(21 citation statements)

References 22 publications

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“…The same theory that finds T w ϭ1.7 K for Cs- 4 He predicts T w ϭ1.3 K for Rb-4 He 6 but experiments have found much lower values. On bulk Rb the prewetting line, measured in the temperature range 1.0 to 1.7 K, extrapolates to T w Ϸ0 K. 7 On quench-condensed Rb the measured prewetting line did not look as though it would intersect the coexistence line at any temperature which suggests that Rb is wetted by 4 He at Tϭ0 K. [8][9][10] On bulk Rb we have reported T w ϭ0.3 K. 11 There is then the important question why the good agreement between experiment and theory for Cs- 4 He turns to extreme disagreement for Rb- 4 He, especially as the same theoretical and experimental practitioners have worked on both Cs and Rb.…”

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confidence: 87%

Nonwetting of liquid4Heon Rb

Klier

Wyatt

2002

Phys. Rev. B

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After Cs, Rb is the next weakest binding substrate for 4 He. The wetting temperature has been found to be close to zero or prewetting continues down to Tϭ0. However, theory predicts T w ϭ1.3 K. We have measured the flow of liquid 4 He over a pure Rb and oxidized Rb surface. For the pure Rb nonwetting of 4 He is observed and the nonwetting thin-film state is about 0.3 monolayers thick and superfluid. For the oxidized Rb complete wetting is observed. These results are compared and we revise our previous conclusion that T w Ϸ300 mK. We show that T w is greater than 300 mK.

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confidence: 87%

Nonwetting of liquid4Heon Rb

Klier

Wyatt

2002

Phys. Rev. B

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“…Since the discovery in 1991 that superfluid helium-4 does not wet Cesium at low temperatures [6], this system has proven to be useful for studies of some general features of the wetting transition such as the prewetting transition [7,8] or the roughness of the CL on a disordered substrate [9]. Because of its unique properties, the He-Cs system is also a good candidate to investigate the dynamics of the CL.…”

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confidence: 98%

Thermally Activated Motion of the Contact Line of a Liquid4HeMeniscus on a Cesium Substrate

1999

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We have measured the contact angle of a liquid helium-4 meniscus on a cesium substrate as a function of the velocity of the three phase contact line, at various temperatures. The velocity is found to vary exponentially with the applied force. We show that the contact line advances through thermally activated jumps. Their area of about 125 nm 2 is probably related to the roughness of the cesium substrate which is evaporated at low temperature.

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“…Rubidium is a slightly stronger adsorber than cesium, but the uncertainties in the potential parameters preclude a definitive prediction of whether there is a true wetting transition at coexistence [30]. Most of the existing data [40,42] are consistent with a picture in which wetting takes place via a peculiar hysteretic transition that extends to the lowest temperatures, as shown in Fig. 6 (see however [44]).…”

Section: Interactions With Superfluiditymentioning

confidence: 64%

Wetting, Prewetting and Superfluidity

Taborek

2009

J Low Temp Phys

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Experiments on adsorption and wetting of quantum fluids ( 4 He and 3 He) on weakly binding alkali metal substrates are reviewed. Helium on weak substrates can undergo a variety of phase transitions including wetting, prewetting, layering, and liquid-vapor transitions. Another characteristic feature of weak substrates is the absence of an immobile quasi solid layer which is present on all conventional strong substrates. Both the absence of the immobile layer and the interaction with surface phase transitions can strongly affect superfluid onset. The Kosterlitz-Thouless superfluid transition can terminate in either a critical endpoint where it meets a first order structural transition or a tricritical point where it meets critical point such as the prewetting critical point or the 2D liquid-vapor critical point.

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Wetting properties of liquid helium on rubidium metal

Cited by 43 publications

References 22 publications

Nonwetting of liquid4Heon Rb

Nonwetting of liquid4Heon Rb

Thermally Activated Motion of the Contact Line of a Liquid4HeMeniscus on a Cesium Substrate

Wetting, Prewetting and Superfluidity

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