The magnetothermal conductivity of p-type germanium

Measurements have been made of the effect of magnetic fields up to 13 T on the low-temperature thermal conductivity of p-Ge. The very small positive increase found previously in measurements up to 5.5 T on a gallium-doped sample is a general feature in similar samples throughout the concentration range 1*10 14 to 1*10 16 cm -3 and also occurs in an indium-doped sample in this range. A temperature dependent minimum occurs at fields greater than 10 T. Approximate values of the spin-Hamiltonian parameters, g 1 ', g 2 ', q 2 and q 3 , obtained from the data are in good agreement with recent values by Tokumoto and Ishiguro (1974). The g-values are much lower than the theoretical values and these low values and the resonant scattering by acceptors in distorted sites are thought to be the reason for the very small magnetoresistance below 5 T.