Cyclotron Masses in Semiconducting Bi1−xSbx Alloys

Cyclotron resonance measurements are carried out on a great number of semiconductive Bi 1– x ‐Sb x ; alloys in the range of 0.07 < x ≦ 0.17. The measuring frequencies are 35 and 70 GHz, and the measurements are carried out at helium temperatures. For the smallest cyclotron mass, a linear relationship to the antimony concentration is found. The more rapid increase of the great cyclotron masses and the associated increase of the elongation of the iso‐energy surfaces with increasing antimony concentration presents the greatest difficulty as compared to the known dispersion relations of the electron bands.