Effect of boundary condition on Kapitza resistance between superfluid $^{3}$He-B and sintered metal
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 He-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 thermalise with the sinter. Finally, we find that the Kapitza resistance is approximately doubled with the addition of two mono-layers of solid He on the sinter surface, which we attribute to an extra magnetic channel of heat transfer being closed as the non-magnetic solid He replaces the magnetic solid He.
Keywords
Cite
@article{arxiv.2005.05838,
title = {Effect of boundary condition on Kapitza resistance between superfluid $^{3}$He-B and sintered metal},
author = {S. Autti and A. M. Guénault and R. P. Haley and A. Jennings and G. R. Pickett and R. Schanen and A. A. Soldatov and V. Tsepelin and J. Vonka and D. E. Zmeev},
journal= {arXiv preprint arXiv:2005.05838},
year = {2020}
}
Comments
7 pages, 4 figures