Abstract
The magnetic field effect on acoustic attenuation in lightly Sb-doped Ge was measured at liquid He temperatures under uniaxial stress. The direction of the uniaxial stress was in parallel with that of the magnetic field. The attenuation of 1 GHz acoustic waves was measured as a function of the magnetic field up to 60 kG under fixed uniaxial stress. The experimental results were compared with the theory, in which it is shown that the attenuation is caused by the relaxation of the system into an instantaneous local thermal equilibrium by the acoustic waves under the consideration of' the influence on the donor wave function of each valley by the uniaxial stress and the magnetic field. It was found that the effect of the magnetic field is far larger than that of the present theory (i.e., the Zeeman effect).
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