New experimental results on the static and the transient anomalous Kapitza conductance of clean copper to4He interfaces

✍ Scribed by K. C. Rawlings; J. C. A. Sluijs

• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 626 KB
• Volume: 33
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00115002

✦ Synopsis

Experiments are described on the power dependence of the Kapitza conductance of copper at temperatures between 1 and 2 K. It is shown that the effects found earlier by Cheeke et al. are much enhanced on clean copper surfaces. New transient effects with long delay times up to lO00 sec are reported. It is confirmed that the origin of the anomalous Kapitza conductance is situated in the layer of superfluid helium next to the interface. A model for the steady state effect is proposed in terms of localized heat transfer. Recent improvements in the measuring techniques for the ordinary Kapitza conductance between metals and superfluid 4He have made it possible to obtain improved and reproducible experimental results. 4-7

In this paper are described experimental results on the effect described by Cheeke and co-workers, in the following called "anomalous Kapitza conductance," obtained with these improved techniques. In Section 2 a brief description is given of the experimental apparatus. For further details the reader is referred to earlier work. 8"9 In Section 3 the results obtained by *Supported by the Science Research Council.