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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Effect of the boundary condition on the Kapitza resistance between superfluid 3He-B and sintered metal
AU - Autti, Samuli
AU - Guénault, Tony
AU - Jennings, Ash
AU - Haley, Richard
AU - Pickett, George
AU - Schanen, Roch
AU - Tsepelin, Viktor
AU - Vonka, Jakub
AU - Zmeev, Dmitry
AU - Soldatov, Arkady
N1 - © 2020 American Physical Society
PY - 2020/8/25
Y1 - 2020/8/25
N2 - 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.
AB - 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.
KW - Liquid He-3
KW - Low temperature
U2 - 10.1103/PhysRevB.102.064508
DO - 10.1103/PhysRevB.102.064508
M3 - Journal article
VL - 102
JO - Physical Review B: Condensed Matter and Materials Physics
JF - Physical Review B: Condensed Matter and Materials Physics
SN - 2469-9950
M1 - 064508
ER -