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Absence of critical point wetting near the He-3-He-4 tri-critical point

机译:He-3-He-4三临界点附近没有临界点润湿

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摘要

We have measured the contact angle of the He-3-He-4 interface on a sapphire window near the tri-critical temperature T-t = 0.87 K. We have found that it is finite and that it increases with temperature above 0.81 K. This behavior is opposite to the "critical point wetting" which is usually observed near critical points. Our results confirm earlier MRI measurements by Ueno et al. [1]. We interpret our observations as due to the critical Casimir effect which leads to an effective attraction of the He-3-He-4 interface by the substrate near the superfluid transition at T-t. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 5]
机译:我们已经测量了蓝宝石窗口上的He-3-He-4界面在三临界温度Tt = 0.87 K附近的接触角。我们发现它是有限的,并且在温度高于0.81 K时会增加。这与通常在临界点附近观察到的“临界点润湿”相反。我们的结果证实了Ueno等人的早期MRI测量结果。 [1]。我们将观察结果解释为由于关键的卡西米尔效应,该效应导致T-3-t处超流体转变附近的底物有效吸引He-3-He-4界面。 (C)2003 Elsevier Science B.V.保留所有权利。 [参考:5]

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