Galvanomagnetic properties of Mn k Hg 1– k Te under hydrostatic pressure

The variation of the Hall coefficient and the electrical conductivity under hydrostatic pressure up to 10 katm and in the temperature range from 77 to 300 K was measured in mixed crystals of Mn k Hg 1– k Te ( k < 0.10). From the analysis of the pressure and temperature dependences of the electron concentration the energy gap E 0 = E (Γ 6 ) − E (Γ 8 ) was determined for k = 0.012; 0.05; 0.07; and 0.09 in the temperature interval from 77 t o 300 K. If is found, that the energy gap dependence is linear with composition within the investigated range of composition. It is established, that α = d E 0 /d T and γ = d E 0 /d p are positive and equal 5 × 10 −4 eV/deg, and 9 × 10 −6 eV/atm, respectively. This is the first attempt to determine the dependence of the energy gap on the composition in Mn k Hg 1− k Te mixed crystals for k < 0.10. The obtained results are quite similar to the energy dependence on composition in Cd x Hg 1− x Te, but significant differences occur in quantitative values.