Two-band model parameters deduced from Hall coefficient measurements in polycrystalline films of SnTe

The authors propose a two-band model for explaining Hall coefficient measurements in a weak magnetic field in SnTe polycrystalline films. The first band is a non-ellipsoidal nonparabolic Cohen type and the second band is parabolic. From the low temperature results the authors deduced m d1 and the anisotropy coefficient K al and some second band characteristics. The results for T>100K are used for testing values of m d2 . By means of this test and the comparison of electrical resistivity corresponding to one- and two-band models the authors deduce that the second band must be lighter than the first. The most convenient model corresponds to m d1 =0.1442 m 0 , K a1 =0.253, m d2 <0.3 m 0 and K a2 <0.75.