Galvanomagnetic properties of Mn_<i>k</i>Hg_1–<i>k</i>Te under hydrostatic pressure

Abstract

Abstract 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 &lt; 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 &lt; 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.