The Faraday Effect Approach to a Study of A IV B VI Narrow‐Gap Semiconductor Band Structure

The magnetooptical Faraday effect in the transparency range ħh ω ≦ E g of Pb 1− x Sn x Te (0 ≦ x ≦ 0.23) and PbSe single crystals with carrier concentrations from 2 × 10 16 to 2 × 10 18 cm −3 is investigated under applied magnetic fields up to 6 T over the temperature range T = 4.2 to 300 K. g ‐factors and effective masses of carriers are determined within the range of T = 4.2 to 300 K. It is shown that the experimental results with or without quantization of the energy spectrum may be interpreted only under condition ∣ g c ∣ > ∣ g v ∣, where g c and g v are the g ‐factors of electrons and holes. Some new values of Dimmock six‐band model parameters g   t ±and g   l ±are obtained taking into account ∣ g c ∣ > ∣ g v ∣ condition.