We report the first measurement of magnon thermal conductivity in monodomain single crystals of He3 in the U2D2 antiferromagnetic phase. The magnon mean free path was found first to rise rapidly upon cooling below TN and then more slowly at low temperatures, depending on the sample. The temperature dependence is consistent with magnon umklapp scattering at high T, i.e.,proportional to T-2 expkBT), with determined to be 5.8 mK. The limiting low-temperature values of varied from 0.3 to 3 m.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)