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  • Effect of Boundary Condition on Kapitza Resistance

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Effect of the boundary condition on the Kapitza resistance between superfluid 3He-B and sintered metal

Research output: Contribution to journalJournal article

Published
Article number064508
<mark>Journal publication date</mark>25/08/2020
<mark>Journal</mark>Physical Review B: Condensed Matter and Materials Physics
Volume102
Number of pages6
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Understanding the temperature dependence of thermal boundary resistance, or Kapitza resistance, between liquid helium and sintered metal has posed a problem in low temperature physics for decades. In the ballistic regime of superfluid 3He-B, we find the Kapitza resistance can be described via scattering of thermal excitations (quasiparticles) with a macroscopic geometric area, rather than the sintered metal's microscopic area. We estimate that a quasiparticle needs on the order of 1000 collisions to successfully thermalize with the sinter. Finally, we find that the Kapitza resistance is approximately doubled with the addition of two mono-layers of solid 4He on the sinter surface, which we attribute to an extra magnetic channel of heat transfer being closed as the non-magnetic solid 4He replaces the magnetic solid 3He.

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© 2020 American Physical Society