抄録
We investigate the effect of the domain wall on the thermal conductivity of solid 3He in U2D2 phase. In our previous work, assuming that the magnetic plane defects are in the single domain crystal, we showed that our model was able to explain the temperature dependence of the thermal conductivity at low temperatures qualitatively. In the U2D2 phase, it is well known that there exist three domains characterized by the anisotropy axes. The static structure of the domain wall separating these domains was investigated by Tsubota et al. and it was reported recently that the structure they had proposed was consistent with the experimental data. In this situation, it is interesting to see whether the predicted domain wall pervents the magnon transfer or not. We apply the same method of our previous work to this system, and calculate the thermal conductivity. We also estimate the effect of the external magnetic field because the strong magnetic field was applied in the experiment. From these investigations, we conclude that the domain wall has little effect on the thermal conductivity.
