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Kapitza conductance of crystals cleaved under He II

โœ Scribed by P.W. Eckels; J.H. Parker Jr; A. Patterson

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
672 KB
Volume
26
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

The Kapitza conductance of LiF and KBr single crystals has been measured immediately after cleaving under superfluid helium. Heating techniques were used to evaluate the conductance and it approached the phonon radiation limit for these materials. Cleaving LiF under He II reduced the Kapitza conductance compared to an aged, cleaved surface by only a few percent. Despite the very good cleaved surface obtained with LiF crystals, the results suggest that sufficient microfracturin(j of the surface occurs upon cleaving to significantly increase the Kapitza conductance over the acoustic mismatch theory values. These results are in contradiction to results obtained by phonon reflection techniques.

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