Abstract
The low temperature thermal conductivity of yttrium iron garnet was measured. It shows the following features: a quadratic temperature dependence at liquid helium temperatures, a decrease in conductivity with an applied magnetic field in the same temperature region, which becomes more pronounced with decreasing temperature but which is not observed at liquid hydrogen temperature and, finally, a slight increase in conductivity with an applied longitudinal field of approximately 300 G. All these features can be understood, assuming that the main contribution to the thermal conductivity in this temperature region comes from spin waves rather than phonons.
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