Composition Dependence of the Anisotropy of the Cyclotron Masses in n‐Type Semiconducting Bi1‐xSbx

Abstract
The anisotropy of the band‐edge cyclotron masses of n‐type Bi1‐xSbx (0.07 ≦ x ⪅ 0.16) in the binary plane is determined by investigating the wave propagation in the Voigt configuration BC2k. At low antimony concentrations (x ≤ 0.10) the anisotropy is independent of x. For x > 0.10 a strong change is observed, where at x ≈ 0.15 a distinct maximum is achieved. These peculiarities can be described by a great variation of the model parameters which determine the energy dispersion in the direction of elongation of the Fermi surface.