Magnetoacoustic Attenuation in Semimetals. IV. Line Shape Analysis of Giant Quantum Attenuation in Bismuth and Bismuth-Antimony Alloys

A theory of the giant quantum attenuation of sound waves in semimetals is compared with our experiments for bismuth and bismuth-antimony alloys. The theory is based on Nagai-Fukuyama's one but some improvements are made to be applicable to semimetals at a high magnetic field. It is shown that by taking account of both the dislocation strains and chemical impurities a reasonable agreement with the experiments for the line shape can be obtained for bismuth. On the other hand, discrepancies between the theory and the experiments for bismuth-antimony alloys are considerable, especially, for the concentration dependence of the attenuation coefficient.