Hypersonic Attenuation in Sb Doped Germanium

Abstract

Hypersonic attenuation in Sb doped Ge is measured. In the attenuation vs. temperature curve, a large peak is found at 1.8°K. A hypersonic sournd used is longitudinal waves of 1 GHz propagating along the <111> axis of Ge crystal which contained about 1×1014, 1×1015 and 1×1016/cm3 donors. The above attenuation peak seems to be due to the electronic relaxation between the singlet and the triplet states of the donors in Ge, as discussed by M. Pomerantz in the case of As- or P-doped Ge.