Lattice thermal conductivity of copper alloys below 2 K

Thermal-conductivity measurements have been made between 0.06 and 2 K on copper samples containing 10-at.% Al. The data suggest that thermal phonons are resonantly scattered by dislocations at a frequency of ≈10¹¹ Hz. The scattering of phonons by conduction electrons is in agreement with theory in both temperature dependence and magnitude. No unusual behavior has been observed in the thermal conductivity of CuAl, CuNi, or CuZn alloys near 0.5 K as had previously been reported.