Abstract
We report the first measurements of heat transport due to thermal magnons in mono-domain single crystals of U2D2 3He. Between about 0.95Tc and 0.65Tc we find clear evidence for umklapp scattering with an activation energy of 5.8±0.3 mK, with a much weaker temperature dependence at lower T. Our limiting mean free paths varied from 0.3 μm to 3 μm depending upon crystal orientation. We have also measured the thermal resistance between the U2D2 solid and the bulk B superfluid phase between 0.35 mK and 0.6 mK, where we find an activated conductivity with an energy of 4.5±0.3 mK. The heat path involves both the solid-liquid boundary resistance and the resistance of superfluid in a 1 mm diameter tube.
Original language | English (US) |
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Pages (from-to) | 204-208 |
Number of pages | 5 |
Journal | Physica B: Physics of Condensed Matter |
Volume | 169 |
Issue number | 1-4 |
DOIs | |
State | Published - Feb 2 1991 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering