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

*S. Autti, A.M. Guénault, R.P. Haley, A. Jennings, G.R. Pickett, R. Schanen, A.A. Soldatov, V. Tsepelin, J. Vonka, D.E. Zmeev*

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 thermalise 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.

*arXiv:2005.05838*

arxiv:

*http://arxiv.org/abs/2005.05838*