Shubnikov-de Haas Measurements in N-Type Pb1-xSnxTe

Relatively large n-type Pb1-xSnxTe single crystals with various x values (x=0–0.28) were prepared and the Shubnikov-de Haas oscillations were measured. The results indicate that the Fermi surface consists of four [111] spheroids whose anisotropies increase with decreasing band gap. The effective mass and effective g*-values of the conduction band were estimated as functions of the alloy composition, and the results are analyzed by a simple two-band non-parabolic model, which gives the transverse momentum matrix element P⊥=√0.58(1+0.211x)/2, and the longitudinal momentum matrix element P//=√0.046(1-0.142x)/2, both in atomic units (a.u.).